6D6-28199-26

Read this manual carefully before operating thisoutboard motor.

OWNER’S MANUAL

F75BF80BF90BF100D

6D6-28199-26-E0

U6D626E0.book Wednesday, October 22, 2008 9:47 AM

Read this manual carefully before operating this outboard motor. Keep thismanual onboard in a waterproof bag when boating. This manual should staywith the outboard motor if it is sold.

U6D626E0.book Page 1 Wednesday, October 22, 2008 9:47 AM

Important manual informationEMU25105

To the ownerThank you for choosing a Yamaha outboardmotor. This Owner’s Manual contains infor-mation needed for proper operation, mainte-nance and care. A thorough understanding ofthese simple instructions will help you obtainmaximum enjoyment from your new Yamaha.If you have any question about the operationor maintenance of your outboard motor,please consult a Yamaha dealer.In this Owner’s Manual particularly importantinformation is distinguished in the followingways.

: This is the safety alert symbol. It is usedto alert you to potential personal injury haz-ards. Obey all safety messages that followthis symbol to avoid possible injury or death.

WARNINGEWM00781

A WARNING indicates a hazardous situa-tion which, if not avoided, could result indeath or serious injury.

NOTICEECM00701

A NOTICE indicates special precautionsthat must be taken to avoid damage to theoutboard motor or other property.

TIP:A TIP provides key information to make pro-cedures easier or clearer.

Yamaha continually seeks advancements inproduct design and quality. Therefore, whilethis manual contains the most current productinformation available at the time of printing,there may be minor discrepancies between

your machine and this manual. If there is anyquestion concerning this manual, please con-sult your Yamaha dealer.To ensure long product life, Yamaha recom-mends that you use the product and performthe specified periodic inspections and mainte-nance by correctly following the instructions inthe owner’s manual. Any damage resultingfrom neglect of these instructions is not cov-ered by warranty.Some countries have laws or regulations re-stricting users from taking the product out ofthe country where it was purchased, and itmay be impossible to register the product inthe destination country. Additionally, the war-ranty may not apply in certain regions. Whenplanning to take the product to another coun-try, consult the dealer where the product waspurchased for further information.If the product was purchased used, pleaseconsult your closest dealer for customer re-registration, and to be eligible for the specifiedservices.

TIP:The F75BET, F80BET, F90BET, F100DETand the standard accessories are used as abase for the explanations and illustrations inthis manual. Therefore some items may notapply to every model.EMU25121

F75B, F80B, F90B, F100DOWNER’S MANUAL

©2008 by Yamaha Motor Co., Ltd.1st Edition, October 2008

All rights reserved.Any reprinting or unauthorized usewithout the written permission of

Yamaha Motor Co., Ltd.is expressly prohibited.

Printed in Japan


Table of contents

Safety information.............................1Outboard motor safety .................... 1

Propeller ............................................. 1Rotating parts ..................................... 1Hot parts............................................. 1Electric shock ..................................... 1Power trim and tilt............................... 1Engine shut-off cord (lanyard) ............ 1Gasoline ............................................. 1Gasoline exposure and spills ............. 1Carbon monoxide ............................... 2Modifications ...................................... 2

Boating safety ................................. 2Alcohol and drugs............................... 2Personal flotation devices .................. 2People in the water............................. 2Passengers ........................................ 2Overloading ........................................ 2Avoid collisions................................... 2Weather.............................................. 3Passenger training ............................. 3Boating safety publications................. 3Laws and regulations ......................... 3

General information ..........................4Identification numbers record.......... 4

Outboard motor serial number ........... 4Key number ........................................ 4

EC Declaration of Conformity (DoC)............................................ 4

CE Marking ..................................... 4C-Tick label ..................................... 5Read manuals and labels................ 6

Warning labels.................................... 6Specifications and requirements.....9

Specifications .................................. 9Installation requirements ............... 11

Boat horsepower rating .................... 11Mounting motor ................................ 11

Remote control requirements........ 11Battery requirements..................... 11

Battery specifications ....................... 11Mounting battery............................... 11

Propeller selection ........................ 11Start-in-gear protection ................. 12Engine oil requirements ................ 12Fuel requirements ......................... 13

Gasoline ........................................... 13Muddy or acidic water ................... 13Anti-fouling paint ........................... 13Motor disposal requirements......... 14Emergency equipment .................. 14Emission control information......... 14

U.S. insular areas............................. 14Components .................................... 15

Components diagram.................... 15Fuel tank........................................... 16Fuel joint ........................................... 16Fuel gauge ....................................... 17Fuel tank cap.................................... 17Air vent screw................................... 17Remote control box .......................... 17Remote control lever ........................ 17Neutral interlock trigger .................... 17Neutral throttle lever ......................... 17Tiller handle...................................... 18Gear shift lever ................................. 18Throttle grip ...................................... 18Throttle indicator............................... 18Throttle friction adjuster .................... 19Engine shut-off cord (lanyard) and

clip................................................. 19Engine stop button ........................... 20Main switch....................................... 20Steering friction adjuster................... 21Power trim and tilt switch on remote

control or tiller handle.................... 21Power trim and tilt switch on bottom

engine cowling .............................. 21Variable trolling RPM switches......... 22Trim tab with anode.......................... 22Tilt support lever for power trim and

tilt model........................................ 23Top cowling lock lever

(pull up type) ................................. 23Flushing device ................................ 24Fuel filter/Water separator ................ 24


Table of contents

Alert indicator ................................... 24Instruments and indicators ............ 25

Indicators....................................... 25Low oil pressure-alert indicator ........ 25Overheat-alert indicator.................... 25

Digital tachometer ......................... 25Tachometer ...................................... 26Trim meter ........................................ 26Hour meter ....................................... 26Low oil pressure-alert indicator ........ 26Overheat-alert indicator.................... 27

Digital speedometer ...................... 27Speedometer.................................... 27Fuel gauge ....................................... 27Trip meter / Clock / Voltmeter........... 28Fuel level-alert indicator ................... 29Low battery voltage-alert indicator ... 29

6Y8 Multifunction meters............... 296Y8 Multifunction tachometers ...... 29

Start-up checks ................................ 30Low oil pressure-alert ....................... 30Overheat alert................................... 30Water separator alert........................ 31Engine trouble alert .......................... 31Low battery voltage-alert .................. 31

6Y8 Multifunction speedometers... 316Y8 Multifunction fuel

management meters .................. 32Engine control system.................... 33

Alert system .................................. 33Overheat alert................................... 33Low oil pressure alert ....................... 33

Installation .......................................35Installation ..................................... 35

Mounting the outboard motor ........... 35Operation ......................................... 37

First-time operation ....................... 37Fill engine oil .................................... 37Breaking in engine............................ 37Getting to know your boat ................ 37

Checks before starting engine ...... 37Fuel level .......................................... 38Remove cowling ............................... 38

Fuel system ...................................... 38Controls ............................................ 39Engine shut-off cord (lanyard) .......... 39Engine oil.......................................... 39Engine .............................................. 40Flushing device ................................ 40Install cowling ................................... 40Power trim and tilt system ................ 41Battery .............................................. 41

Filling fuel...................................... 41Operating engine .......................... 42

Sending fuel (portable tank) ............. 42Starting engine ................................. 43

Checks after starting engine ......... 46Cooling water ................................... 46

Warming up engine....................... 46Electric start models ......................... 46

Checks after engine warm-up ....... 46Shifting ............................................. 46Stop switches ................................... 46

Shifting .......................................... 47Stopping boat................................ 48Trolling .......................................... 48

Adjusting trolling speed .................... 48Stopping engine............................ 49

Procedure......................................... 49Trimming outboard motor.............. 49

Adjusting trim angle (Power trim and tilt) ....................... 50

Adjusting boat trim............................ 51Tilting up and down....................... 51

Procedure for tilting up (power trim and tilt models)........... 52

Procedure for tilting down (power trim and tilt models)........... 53

Shallow water................................ 54Power trim and tilt models ................ 54

Cruising in other conditions........... 55Maintenance .................................... 56

Transporting and storing outboard motor.......................................... 56Storing outboard motor..................... 56Procedure......................................... 57


Table of contents

Lubrication........................................ 58Flushing power unit .......................... 58Cleaning the outboard motor............ 59Checking painted surface of motor... 59

Periodic maintenance.................... 60Replacement parts ........................... 60Severe operating conditions............. 60Maintenance chart 1......................... 61Maintenance chart 2......................... 63Greasing........................................... 64Cleaning and adjusting spark plug ... 65Changing engine oil.......................... 65Checking wiring and connectors ...... 67Checking propeller ........................... 67Removing propeller .......................... 68Installing propeller ............................ 68Changing gear oil ............................. 69Cleaning fuel tank............................. 70Inspecting and replacing anode(s) ... 71Checking battery

(for electric start models) .............. 71Connecting the battery ..................... 72Disconnecting the battery................. 72

Trouble Recovery............................ 73Troubleshooting ............................ 73Temporary action in emergency.... 76

Impact damage................................. 76Replacing fuse.................................. 76Power trim and tilt will not operate ... 77Water separator-alert indicator

blinks while cruising ...................... 77Starter will not operate ..................... 79Emergency starting engine............... 80

Treatment of submerged motor..... 81


1

Safety informationEMU33622

Outboard motor safetyObserve these precautions at all times.EMU36500

PropellerPeople can be injured or killed if they come incontact with the propeller. The propeller cankeep moving even when the motor is in neu-tral, and sharp edges of the propeller can cuteven when stationary.� Shut off the engine when a person is in the

water near you.� Keep people out of reach of the propeller,

even when the engine is off.EMU33630

Rotating partsHands, feet, hair, jewelry, clothing, PFDstraps, etc. can become entangled with inter-nal rotating parts of the engine, resulting in se-rious injury or death.Keep the top cowling in place whenever pos-sible. Do not remove or replace the cowlingwith the engine running.Only operate the engine with the cowling re-moved according to the specific instructions inthe manual. Keep hands, feet, hair, jewelry,clothing, PFD straps, etc. away from any ex-posed moving parts.EMU33640

Hot partsDuring and after operation, engine parts arehot enough to cause burns. Avoid touchingany parts under the top cowling until the en-gine has cooled.EMU33650

Electric shockDo not touch any electrical parts while startingor operating the engine. They can causeshock or electrocution.EMU33660

Power trim and tiltBody parts can be crushed between the mo-tor and the clamp bracket when the motor istrimmed or tilted. Keep body parts out of this

area at all times. Be sure no one is in this areabefore operating the power trim and tilt mech-anism.The power trim and tilt switches operate evenwhen the main switch is off. Keep people beaway from the switches whenever workingaround the motor.Never get under the lower unit while it is tilted,even when the tilt support lever is locked. Se-vere injury could occur if the outboard motoraccidentally falls.EMU33671

Engine shut-off cord (lanyard)Attach the engine shut-off cord so that the en-gine stops if the operator falls overboard orleaves the helm. This prevents the boat fromrunning away under power and leaving peo-ple stranded, or running over people or ob-jects.Always attach the engine shut-off cord to asecure place on your clothing or your arm orleg while operating. Do not remove it to leavethe helm while the boat is moving. Do not at-tach the cord to clothing that could tear loose,or route the cord where it could become en-tangled, preventing it from functioning.Do not route the cord where it is likely to beaccidentally pulled out. If the cord is pulledduring operation, the engine will shut off andyou will lose most steering control. The boatcould slow rapidly, throwing people and ob-jects forward.EMU33810

GasolineGasoline and its vapors are highly flam-mable and explosive. Always, refuel accord-ing to the procedure on page 42 to reduce therisk of fire and explosion.EMU33820

Gasoline exposure and spillsTake care not to spill gasoline. If gasolinespills, wipe it up immediately with dry rags.Dispose of rags properly.


Safety information

2

If any gasoline spills onto your skin, immedi-ately wash with soap and water. Changeclothing if gasoline spills on it.If you swallow gasoline, inhale a lot of gaso-line vapor, or get gasoline in your eyes, getimmediate medical attention. Never siphonfuel by mouth.EMU33900

Carbon monoxideThis product emits exhaust gases which con-tain carbon monoxide, a colorless, odorlessgas which may cause brain damage or deathwhen inhaled. Symptoms include nausea,dizziness, and drowsiness. Keep cockpit andcabin areas well ventilated. Avoid blocking ex-haust outlets.EMU33780

ModificationsDo not attempt to modify this outboard motor.Modifications to your outboard motor may re-duce safety and reliability, and render the out-board unsafe or illegal to use.EMU33740

Boating safetyThis section includes a few of the many im-portant safety precautions that you should fol-low when boating.EMU33710

Alcohol and drugsNever operate after drinking alcohol or takingdrugs. Intoxication is one of the most commonfactors contributing to boating fatalities.EMU33720

Personal flotation devicesHave an approved personal flotation device(PFD) on board for every occupant. Yamaharecommends that you must wear a PFDwhenever boating. At a minimum, childrenand non-swimmers should always wearPFDs, and everyone should wear PFDs whenthere are potentially hazardous boating condi-tions.

EMU33730

People in the waterAlways watch carefully for people in the wa-ter, such as swimmers, skiers, or divers,whenever the engine is running. When some-one is in the water near the boat, shift intoneutral and shut off the motor.Stay away from swimming areas. Swimmerscan be hard to see.The propeller can keep moving even whenthe motor is in neutral. Shut off the enginewhen a person is in the water near you.EMU33750

PassengersConsult your boat manufacturer’s instructionsfor details about appropriate passenger loca-tions in your boat and be sure all passengersare positioned properly before acceleratingand when operating above an idle speed.Standing or sitting in non-designated loca-tions may result in being thrown either over-board or within the boat due to waves, wakes,or sudden changes in speed or direction.Even when people are positioned properly,alert your passengers if you must make anyunusual maneuver. Always avoid jumpingwaves or wakes.EMU33760

OverloadingDo not overload the boat. Consult the boat ca-pacity plate or boat manufacturer for maxi-mum weight and number of passengers. Besure that weight is properly distributed ac-cording to the boat manufacturers instruc-tions. Overloading or incorrect weightdistribution can compromise the boats han-dling and lead to an accident, capsizing orswamping.EMU33772

Avoid collisionsScan constantly for people, objects, and otherboats. Be alert for conditions that limit yourvisibility or block your vision of others.


Safety information

3

Operate defensively at safe speeds and keepa safe distance away from people, objects,and other boats.� Do not follow directly behind other boats or

waterskiers.� Avoid sharp turns or other maneuvers that

make it hard for others to avoid you or un-derstand where you are going.

� Avoid areas with submerged objects orshallow water.

� Ride within your limits and avoid aggressivemaneuvers to reduce the risk of loss of con-trol, ejection, and collision.

� Take early action to avoid collisions. Re-member, boats do not have brakes, andstopping the engine or reducing throttle canreduce the ability to steer. If you are notsure that you can stop in time before hittingan obstacle, apply throttle and turn in anoth-er direction.

EMU33790

WeatherStay informed about the weather. Checkweather forecasts before boating. Avoid boat-ing in hazardous weather.EMU33880

Passenger trainingMake sure at least one other passenger istrained to operate the boat in the event of anemergency.

EMU33890

Boating safety publicationsBe informed about boating safety. Additionalpublications and information can be obtainedfrom many boating organizations.EMU33600

Laws and regulationsKnow the marine laws and regulations whereyou will be boating- and obey them. Severalsets of rules prevail according to geographiclocation, but all are basically the same as theInternational Rules of the Road.

ZMU06025


General information

4

EMU25171

Identification numbers recordEMU25183

Outboard motor serial numberThe outboard motor serial number is stampedon the label attached to the port side of theclamp bracket.Record your outboard motor serial number inthe spaces provided to assist you in orderingspare parts from your Yamaha dealer or forreference in case your outboard motor is sto-len.

EMU25190

Key numberIf a main key switch is equipped with the mo-tor, the key identification number is stampedon your key as shown in the illustration.Record this number in the space provided forreference in case you need a new key.

EMU37290

EC Declaration of Conformity (DoC)

This outboard motor conforms to certain por-tions of the European Parliament directive re-lating to machinery.Each conformed outboard motor accompa-nied with EC DoC.EC DoC contains the fol-lowing information;� Name of Engine Manufacture� Model name� Product code of model (Approved model

code)� Code of conformed directivesEMU25203

CE MarkingOutboard motors affixed with this “CE”mark-ing conform with the directives of; 98/37/EC,94/25/EC - 2003/44/EC and 2004/108/EC.

1. Outboard motor serial number location

1

ZMU04214

1. Key number


General information

5

EMU25213

C-Tick labelEngines affixed with this label conform to cer-tain portion(s) of the Australian Radio Com-munications Act.

1. CE marking location

1. C-Tick label location

ZMU06040

1

ZMU04218

ZMU01697


General information

6

EMU33520

Read manuals and labelsBefore operating or working on this motor:� Read this manual.� Read any manuals supplied with the boat.� Read all labels on the outboard motor and the boat.If you need any additional information, contact your Yamaha dealer.EMU33831

Warning labelsIf these labels are damaged or missing, contact your Yamaha dealer for replacements.F75B, F80B, F90B, F100D


General information

7

EMU33912

Contents of labelsThe above warning labels mean as follows.1

WARNINGEWM01691

Emergency starting does not have start-in-gear protection. Ensure shift control isin neutral before starting engine.

2

WARNINGEWM01681

� Keep hands, hair, and clothing awayfrom rotating parts while the engine isrunning.

� Do not touch or remove electrical partswhen starting or during operation.

3

WARNINGEWM01671

� Read Owner’s Manuals and labels.� Wear an approved personal flotation de-

vice (PFD).� Attach engine shut-off cord (lanyard) to

your PFD, arm, or leg so the enginestops if you accidentally leave the helm,which could prevent a runaway boat.

ZMU05706

1 2

3


General information

8

EMU33843

SymbolsThe following symbols mean as follows.

Notice/Warning

Read Owner’s Manual

Hazard caused by continuous rotation

Electrical hazard

Remote control lever/gear shift lever operat-ing direction, dual direction

Engine start/ Engine cranking

ZMU05696

ZMU05664

ZMU05665

ZMU05666

ZMU05667

ZMU05668


Specifications and requirements

9

EMU34520

SpecificationsTIP:“(AL)” stated in the specification data belowrepresents the numerical value for the alumi-num propeller installed.Likewise, “(SUS)” represents the value forstainless steel propeller installed and “(PL)”for plastic propeller installed.

TIP:“*” means, select the engine oil referring to thechart of engine oil paragraph. For further infor-mation, see page 12.EMU2821D

Dimension:Overall length:

F100DET 825 mm (32.5 in)F75BET 817 mm (32.2 in)F80BET 825 mm (32.5 in)F90BET 825 mm (32.5 in)

Overall width:479 mm (18.9 in)

Overall height L:1582 mm (62.3 in)

Overall height X:F100DET 1709 mm (67.3 in)F75BET 1710 mm (67.3 in)F80BET 1709 mm (67.3 in)F90BET 1709 mm (67.3 in)

Transom height L:536 mm (21.1 in)

Transom height X:664 mm (26.1 in)

Weight (AL) L:F100DET 172.0 kg (379 lb)F75BET 170.0 kg (375 lb)F80BET 172.0 kg (379 lb)F90BET 172.0 kg (379 lb)

Weight (AL) X:F100DET 176.0 kg (388 lb)F75BET 174.0 kg (384 lb)F80BET 175.0 kg (386 lb)F90BET 175.0 kg (386 lb)

Weight (SUS) L:F100DET 174.0 kg (384 lb)F75BET 172.0 kg (379 lb)F80BET 174.0 kg (384 lb)F90BET 174.0 kg (384 lb)

Weight (SUS) X:F100DET 179.0 kg (395 lb)F75BET 176.0 kg (388 lb)F80BET 177.0 kg (390 lb)F90BET 177.0 kg (390 lb)

Weight (without propeller) L:F100DET 170.0 kg (375 lb)F75BET 168.0 kg (370 lb)F80BET 170.0 kg (375 lb)F90BET 170.0 kg (375 lb)

Weight (without propeller) X:F100DET 174.0 kg (384 lb)F75BET 172.0 kg (375 lb)F80BET 173.0 kg (381 lb)F90BET 173.0 kg (381 lb)

Performance:Full throttle operating range:

5000–6000 r/minMaximum output:

F100DET 73.6 kW@5500 r/min (100 HP@5500 r/min)F75BET 55.2 kW@5500 r/min (75 HP@5500 r/min)F80BET 58.8 kW@5500 r/min (80 HP@5500 r/min)F90BET 66.2 kW@5500 r/min (90 HP@5500 r/min)

Idling speed (in neutral):700 ±50 r/min



10

Engine:Type:

4-stroke LDisplacement:

1596.0 cm³Bore × stroke:

79.0 × 81.4 mm (3.11 × 3.20 in)Ignition system:

TCISpark plug (NGK):

LFR5A-11Spark plug gap:

1.0–1.1 mm (0.039–0.043 in)Control system:

Remote controlStarting system:

ElectricStarting carburetion system:

Electronic fuel injectionValve clearance (cold engine) IN:

0.17–0.23 mm (0.0067–0.0091 in)Valve clearance (cold engine) EX:

0.31–0.37 mm (0.0122–0.0146 in)Min. cold cranking amps (CCA/EN):

430.0 AMin. rated capacity (20HR/IEC):

70.0 AhMaximum generator output:

25 ADrive unit:

Gear positions:Forward-neutral-reverse

Gear ratio:2.31 (30/13)

Trim and tilt system:Power trim and tilt

Propeller mark:K

Fuel and oil:Recommended fuel:

Regular unleaded gasoline

Min. research octane:90

Fuel tank capacity:24.0 L (6.34 US gal, 5.28 Imp.gal)

Recommended engine oil:4-stroke outboard motor oil

Recommended engine oil group 1*:SAE 10W-30/10W-40/5W-30 API SE/SF/SG/SH/SJ/SL

Recommended engine oil group 2*:SAE 15W-40/20W-40/20W-50 API SH/SJ/SL

Lubrication:Wet sump

Total engine oil quantity (oil pan capacity):Without oil filter replacement:

4.3 L (4.55 US qt, 3.78 Imp.qt)With oil filter replacement:

4.5 L (4.76 US qt, 3.96 Imp.qt)Recommended gear oil:

Hypoid gear oil SAE#90Gear oil quantity:

0.670 L (0.708 US qt, 0.590 Imp.qt)Tightening torque for engine:

Spark plug:25.0 Nm (2.55 kgf-m, 18.4 ft-lb)

Propeller nut:35.0 Nm (3.57 kgf-m, 25.8 ft-lb)

Engine oil drain bolt:28.0 Nm (2.86 kgf-m, 20.7 ft-lb)

Engine oil filter:18.0 Nm (1.84 kgf-m, 13.3 ft-lb)

Noise and vibration level:Operator sound pressure level (ICOMIA 39/94 and 40/94):

F100DET 73.2 dB(A)F80BET 73.2 dB(A)



11

EMU33554

Installation requirementsEMU33563

Boat horsepower rating

WARNINGEWM01560

Overpowering a boat can cause severe in-stability.

Before installing the outboard motor(s), con-firm that the total horsepower of your motor(s)does not exceed the boats maximum horse-power rating. See the boat’s capacity plate orcontact the manufacturer.EMU33571

Mounting motor

WARNINGEWM01570

� Improper mounting of the outboard mo-tor could result in hazardous conditionssuch as poor handling, loss of control,or fire hazards.

� Because the motor is very heavy, spe-cial equipment and training is requiredto mount it safely.

Your dealer or other person experienced inproper rigging should mount the motor usingcorrect equipment and complete rigging in-structions. For further information, see page35.EMU33581

Remote control requirements

WARNINGEWM01580

� If the engine starts in gear, the boat canmove suddenly and unexpectedly, pos-sibly causing a collision or throwingpassengers overboard.

� If the engine ever starts in gear, thestart-in-gear protection device is notworking correctly and you should dis-continue using the outboard. Contactyour Yamaha dealer.

The remote control unit must be equippedwith a start-in-gear protection device(s). Thisdevice prevents the engine from starting un-less it is in neutral.EMU25694

Battery requirementsEMU25721

Battery specifications

The engine cannot be started if battery volt-age is too low.EMU36290

Mounting batteryMount the battery holder securely in a dry,well-ventilated, vibration-free location in theboat. WARNING! Do not put flammableitems, or loose heavy or metal objects inthe same compartment as the battery.Fire, explosion or sparks could result.[EWM01820]

EMU34191

Propeller selectionNext to selecting an outboard, choosing theright propeller is one of the most importantpurchasing decisions a boater can make. Thetype, size, and design of your propeller havea direct impact on acceleration, top speed,fuel economy, and even engine life. Yamahadesigns and manufactures propellers for ev-ery Yamaha outboard motor and every appli-cation.Your outboard motor came with a Yamahapropeller chosen to perform well over a rangeof applications, but there may be uses wherea different propeller would be more appropri-ate.Your Yamaha dealer can help you select theright propeller for your boating needs. Selecta propeller that will allow the engine to reach

Minimum cold cranking amps (CCA/EN):430.0 A

Minimum rated capacity (20HR/IEC):70.0 Ah



12

the middle or upper half of the operatingrange at full throttle with the maximum boat-load. Generally, chose a larger pitch propellerfor a smaller operating load and a smallerpitch propeller for a heavier load. If you carryloads that vary widely, chose the propellerthat lets the engine run in the proper range foryour maximum load but remember that youmay need to reduce your throttle setting tostay within the recommended engine speedrange when carrying lighter loads.For instructions on propeller removal and in-stallation, see page 67.

EMU25760

Start-in-gear protectionYamaha outboard motors affixed with the pic-tured label or Yamaha-approved remote con-trol units are equipped with start-in-gearprotection device(s). This feature permits theengine to be started only when it is in neutral.Always select neutral before starting the en-gine.

EMU37472

Engine oil requirements

If the recommended engine oil grades are notavailable, select an alternative from the fol-lowing chart according to the average temper-atures in your area.

1. Propeller diameter in inches2. Propeller pitch in inches3. Type of propeller (propeller mark)

1. Propeller diameter in inches2. Propeller pitch in inches3. Type of propeller (propeller mark)

ZMU04606

-x1 2 3

ZMU04607

-x1 2 3

1. Start-in-gear protection label

Recommended engine oil:4-stroke motor oil with a combination of the following SAE and API oil classifi-cations

Engine oil type SAE:10W-30 or 10W-40

Engine oil grade API:SE, SF, SG, SH, SJ, SL

Total engine oil quantity (oil pan capaci-ty):

Without oil filter replacement:4.3 L (4.55 US qt, 3.78 Imp.qt)

With oil filter replacement:4.5 L (4.76 US qt, 3.96 Imp.qt)

ZMU01713

1



13

EMU36360

Fuel requirementsEMU36810

GasolineUse a good quality gasoline that meets theminimum octane rating. If knocking or pingingoccurs, use a different brand of gasoline orpremium unleaded fuel. Yamaha recomendsthat you use alcohol-free (see Gasohol) gas-oline whenever possible.

NOTICEECM01980

� Do not use leaded gasoline. Leaded gas-oline can seriously damage the engine.

� Avoid getting water and contaminants inthe fuel tank. Contaminated fuel cancause poor performance or engine dam-age. Use only fresh gasoline that hasbeen stored in clean containers.

GasoholThere are two types of gasohol: gasohol con-taining ethanol (E10) and that containingmethanol. Ethanol can be used if the ethanolcontent does not exceed 10% and the fuelmeets the minimum octane ratings. All etha-nol blends containing more than 10% ethanolcan cause fuel system damage or cause en-gine starting and running problems. Yamahadoes not recommend gasohol containingmethanol because it can cause fuel systemdamage or engine performance problems.EMU36880

Muddy or acidic waterYamaha strongly recommends that you haveyour dealer install the optional chromium-plat-ed water pump kit if you use the outboard mo-tor in muddy or acidic water conditions.However, depending on the model it might notbe required.EMU36330

Anti-fouling paintA clean hull improves boat performance. Theboat bottom should be kept as clean of marinegrowth as possible. If necessary, the boat bot-tom can be coated with an anti-fouling paintapproved for your area to inhibit marinegrowth.Do not use anti-fouling paint which includescopper or graphite. These paints can causemore rapid engine corrosion.

Recommended gasoline:Regular unleaded gasoline with a mini-mum octane rating of 90 (Research Octane Number).



14

EMU36341

Motor disposal requirementsNever illegally discard (dump) the motor.Yamaha recommends consulting the dealerabout discarding the motor.EMU36351

Emergency equipmentKeep the following items onboard in casethere is trouble with the motor.� A tool kit with assorted screwdrivers, pliers,

wrenches (including metric sizes), andelectrical tape.

� Waterproof flashlight with extra batteries.� An extra engine shut-off cord (lanyard) with

clip.� Spare parts, such as an extra set of spark

plugs.Consult your Yamaha dealer for details.EMU25221

Emission control informationEMU25310

U.S. insular areasEngines affixed with the label pictured belowconform to U.S. Environmental ProtectionAgency (EPA) regulations for marine SI en-gines. See the label affixed to your engine fordetails.EMU31570

Approval label of emission control certifi-cateThis label is attached to the bottom cowling.New Technology; (4-stroke) MFI

EMU25332

Manufactured date labelThis label is attached to the clamp bracket orthe swivel bracket.

1. Approval label location

1. Manufactured date label location

1

ZMU04218

Manufactured:

ZMU04346


Components

15

EMU2579M

Components diagramTIP:* May not be exactly as shown; also may not be included as standard equipment on all models.F75B, F80B, F90B, F100D

1. Top cowling2. Top cowling lock lever(s)3. Anti-cavitation plate4. Trim tab (anode)5. Propeller*6. Cooling water inlet7. Clamp bracket8. Flushing device9. Water separator10.Power trim and tilt switch11.Remote control box (side mount type)*12.Digital speedometer*13.Digital tachometer*14.Fuel tank*


Components

16

EMU25802

Fuel tankIf your model was equipped with a portablefuel tank, its function is as follows.

WARNINGEWM00020

The fuel tank supplied with this engine isits dedicated fuel reservoir and must notbe used as a fuel storage container. Com-mercial users should conform to relevantlicensing or approval authority regula-tions. EMU25830

Fuel jointThis joint is used to connect the fuel line.

1

3

2

ZMU05484

1. Tachometer unit (Square type)*2. Speedometer unit (Square type)*3. Fuel management meter (Square type)*

1. Fuel joint2. Fuel gauge3. Fuel tank cap4. Air vent screw

ZMU02284

3

1

4

2


Components

17

EMU25841

Fuel gaugeThis gauge is located on either the fuel tankcap or on the fuel joint base. It shows the ap-proximate amount of fuel remaining in thetank.EMU25850

Fuel tank capThis cap seals the fuel tank. When removed,the tank can be filled with fuel. To remove thecap, turn it counterclockwise.EMU25860

Air vent screwThis screw is on the fuel tank cap. To loosenthe screw, turn it counterclockwise.EMU26181

Remote control boxThe remote control lever actuates both theshifter and the throttle. The electrical switchesare mounted on the remote control box.

EMU26190

Remote control leverMoving the lever forward from the neutral po-sition engages forward gear. Pulling the leverback from neutral engages reverse. The en-gine will continue to run at idle until the lever

is moved about 35° (a detent can be felt).Moving the lever farther opens the throttle,and the engine will begin to accelerate.

EMU26201

Neutral interlock triggerTo shift out of neutral, first pull the neutral in-terlock trigger up.

EMU26211

Neutral throttle leverTo open the throttle without shifting into eitherforward or reverse, put the remote control le-ver in the neutral position and lift the neutralthrottle lever.

1. Power trim and tilt switch2. Remote control lever3. Neutral interlock trigger4. Neutral throttle lever5. Main switch6. Engine shut-off switch7. Throttle friction adjuster

1. Neutral “ ”2. Forward “ ”3. Reverse “ ”4. Shift5. Fully closed6. Throttle7. Fully open

1. Neutral interlock trigger


Components

18

TIP:The neutral throttle lever will operate onlywhen the remote control lever is in neutral.The remote control lever will operate onlywhen the neutral throttle lever is in the closedposition.

EMU25911

Tiller handleTo change direction, move the tiller handle tothe left or right as necessary.

EMU25922

Gear shift leverPulling the gear shift lever towards you putsthe engine in forward gear so that the boatmoves ahead. Pushing the lever away fromyou puts the engine in reverse gear so that theboat moves astern.

EMU25941

Throttle gripThe throttle grip is on the tiller handle. Turnthe grip counterclockwise to increase speedand clockwise to decrease speed.

EMU25961

Throttle indicatorThe fuel consumption curve on the throttle in-dicator shows the relative amount of fuel con-sumed for each throttle position. Choose thesetting that offers the best performance andfuel economy for the desired operation.

1. Fully open2. Fully closed

1. Forward “ ”2. Neutral “ ”3. Reverse “ ”


Components

19

EMU25974

Throttle friction adjusterA friction device provides adjustable resis-tance to movement of the throttle grip or theremote control lever, and can be set accord-ing to operator preference.To increase resistance, turn the adjusterclockwise. To decrease resistance, turn theadjuster counterclockwise. WARNING! Donot overtighten the friction adjuster. Ifthere is too much resistance, it could bedifficult to move the remote control leveror throttle grip, which could result in anaccident. [EWM00032]

When constant speed is desired, tighten theadjuster to maintain the desired throttle set-ting.EMU25993

Engine shut-off cord (lanyard) and clipThe clip must be attached to the engine shut-off switch for the engine to run. The cordshould be attached to a secure place on theoperator’s clothing, or arm or leg. Should theoperator fall overboard or leave the helm, thecord will pull out the clip, stopping ignition tothe engine. This will prevent the boat fromrunning away under power. WARNING! At-tach the engine shut-off cord to a secureplace on your clothing, or your arm or legwhile operating. Do not attach the cord toclothing that could tear loose. Do not routethe cord where it could become entangled,preventing it from functioning. Avoid acci-dentally pulling the cord during normaloperation. Loss of engine power meansthe loss of most steering control. Also,without engine power, the boat could slowrapidly. This could cause people and ob-jects in the boat to be thrown forward.[EWM00122]

1. Throttle indicator


Components

20

EMU26001

Engine stop buttonTo open the ignition circuit and stop the en-gine, push this button.

EMU26090

Main switchThe main switch controls the ignition system;its operation is described below.� “ ” (off)With the main switch in the “ ” (off) posi-tion, the electrical circuits are off, and the keycan be removed.� “ ” (on)With the main switch in the “ ” (on) position,the electrical circuits are on, and the key can-not be removed.� “ ” (start)With the main switch in the “ ” (start) po-sition, the starter motor turns to start the en-gine. When the key is released, it returnsautomatically to the “ ” (on) position.

1. Cord2. Clip3. Engine shut-off switch



Components

21

EMU26111

Steering friction adjusterA friction device provides adjustable resis-tance to the steering mechanism, and can beset according to operator preference. An ad-juster lever is located on the bottom of thetiller handle bracket.To increase resistance, turn the lever to theport side “A”.To decrease resistance, turn the lever to thestarboard side “B”.

WARNINGEWM00040

Do not overtighten the friction adjuster. Ifthere is too much resistance, it could bedifficult to steer, which could result in anaccident.

TIP:� Check the tiller handle for smooth move-

ment when the lever is turned to the star-board side “B”.

� Do not apply lubricants such as grease tothe friction areas of the steering friction ad-juster.

EMU26143

Power trim and tilt switch on remote control or tiller handleThe power trim and tilt system adjusts the out-board motor angle in relation to the transom.Pressing the switch “ ” (up) trims the out-board motor up, and then tilts it up. Pressing

the switch “ ” (down) tilts the outboard motordown and trims it down. When the switch is re-leased, the outboard motor will stop in its cur-rent position.For instructions on using the power trim andtilt switch, see pages 49 and 51.

EMU26153

Power trim and tilt switch on bottom engine cowlingThe power trim and tilt switch is located on theside of the bottom engine cowling. Pressingthe switch “ ” (up) trims the outboard motorup, and then tilts it up. Pressing the switch“ ” (down) tilts the outboard motor down andtrims it down. When the switch is released,the outboard motor will stop in its current po-sition.For instructions on using the power trim andtilt switch, see page 51.


Components

22

WARNINGEWM01030

Use the power trim and tilt switch locatedon the bottom engine cowling only whenthe boat is at a complete stop with the en-gine off. Attempting to use this switchwhile the boat is moving could increasethe risk of falling overboard and could dis-tract the operator, increasing the risk ofcollision with another boat or an obstacle.

EMU30900

Variable trolling RPM switchesThe trolling speed can be adjusted when theoutboard motor is trolling. Press the “ ”switch to increase the trolling speed andpress the “ ” switch to decrease the trollingspeed.

TIP:� The trolling speed changes approximately

50 r/min each time a switch is pressed.� If the trolling speed has been adjusted, the

engine returns to the normal trolling speedwhen the engine is stopped and restartedor when the engine speed exceeds approx-imately 3000 r/min.

� For instructions on using the variable troll-ing RPM switches, see page 48.

EMU26244

Trim tab with anode

WARNINGEWM00840

An improperly adjusted trim tab couldcause difficult steering. Always test run af-ter the trim tab has been installed or re-placed to be sure steering is correct. Besure you have tightened the bolt after ad-justing the trim tab.

The trim tab should be adjusted so that thesteering control can be turned to either theright or left by applying the same amount offorce.If the boat tends to veer to the left (port side),turn the trim tab rear end to the port side “A” inthe figure. If the boat tends to veer to the right(starboard side), turn the trim tab end to thestarboard side “B” in the figure.

NOTICEECM00840

The trim tab also serves as an anode toprotect the engine from electrochemicalcorrosion. Never paint the trim tab as it willbecome ineffective as an anode.

1. Power trim and tilt switch

UP

DN

1

ZMU04231

1. Variable trolling RPM switch


Components

23

EMU26341

Tilt support lever for power trim and tilt modelTo keep the outboard motor in the tilted up po-sition, lock the tilt support lever to the clampbracket.

NOTICEECM00660

Do not use the tilt support lever or knobwhen trailering the boat. The outboard mo-tor could shake loose from the tilt supportand fall. If the motor cannot be trailered inthe normal running position, use an addi-tional support device to secure it in the tiltposition.

EMU26382

Top cowling lock lever (pull up type)To remove the engine top cowling, pull up thelock lever(s) and lift off the cowling. When in-stalling the cowling, check to be sure it fitsproperly in the rubber seal. Then lock thecowling by moving the lever(s) downward.

1. Trim tab2. Bolt3. Cap

Bolt tightening torque:35.0 Nm (3.57 kgf-m, 25.8 ft-lb)

1

2

3

ZMU02525

A

B

AB

ZMU01863

1. Tilt support lever

1. Top cowling lock lever(s)

ZMU05347

1


Components

24

EMU26460

Flushing deviceThis device is used to clean the cooling waterpassages of the motor using a garden hoseand tap water.

TIP:For details on usage, see page 58.

EMU35561

Fuel filter/Water separatorThis engine has a combination fuel filter/waterseparator and associated alert system. If wa-ter separated from the fuel exceeds a specificvolume, the alert device of 6Y8 MultifunctionTachometer will activate.

Activation of alert device� The water separator-alert indicator of 6Y8

Multifunction Tachometer will blink.� The buzzer will sound intermittently only

when the gear shift is in neutral.� If the alert system has activated, stop the

engine and consult a Yamaha dealer imme-diately.

EMU26303

Alert indicatorIf the engine develops a condition which iscause for alert, the indicator lights up. For de-tails on how to read the alert indicator, seepage 33.

1. Top cowling lock lever(s)

1. Flushing device

ZMU05348

1

1. Alert indicator


Instruments and indicators

25

EMU36014

IndicatorsEMU36023

Low oil pressure-alert indicatorIf oil pressure drops too low, this indicator willlight up. For further information, see page 33.

NOTICEECM00022

� Do not continue to run the engine if thelow oil pressure-alert indicator is on andthe engine oil level is lower. Serious en-gine damage will occur.

� The low oil pressure-alert indicator doesnot indicate the engine oil level. Use theoil dipstick to check the remaining oilquantity. For further information, seepage 39.

EMU36032

Overheat-alert indicatorIf the engine temperature rises too high, thisindicator will light up. For further informationon reading the indicator, see page 33.

NOTICEECM00052

Do not continue to run the engine if theoverheat-alert indicator is on. Serious en-gine damage will occur.

EMU31414

Digital tachometerThe tachometer shows the engine speed andhas the following functions.All segments of the display will light momen-tarily after the main switch is turned on andwill return to normal thereafter.

TIP:The water separator-alert indicator and en-gine trouble-alert indicator on the digital ta-chometer do not operate for this engine.

1. Low oil pressure-alert indicator

1. Overheat-alert indicator

1. Tachometer2. Trim meter3. Hour meter4. Low oil pressure-alert indicator5. Overheat-alert indicator6. Set button7. Mode button

ZMU01840

1

5

2

4

3

6 7



26

EMU36050

TachometerThe tachometer displays engine speed inhundreds of revolutions per minute (r/min).For example, if the tachometer display reads“22” then the engine speed is 2200 r/min.EMU26621

Trim meterThis meter shows the trim angle of your out-board motor.� Memorize the trim angles that work best for

your boat under different conditions. Adjustthe trim angle to the desired using the pow-er trim and tilt switch.

� If the trim angle of your motor exceeds thetrim operating range, the top segment onthe trim meter display will blink.

EMU26651

Hour meterThis meter shows the number of hours the en-gine has been run. It can be set to show thetotal number of hours or the number of hoursfor the current trip. The display can also beturned on and off.

To change the display format, press the“ ” (mode) button. The display can showtotal hours or trip hours, or turn off.To reset the trip hours, simultaneously pressthe “ ” (set) and “ ” (mode) buttons formore than 1 second while the trip hours aredisplayed. This resets the trip counter to 0 (ze-ro).The total number of hours the engine hasbeen run cannot be reset.EMU26524

Low oil pressure-alert indicatorIf oil pressure drops too low, the alert indicatorwill start to blink. For further information, seepage 33.

NOTICEECM00022

� Do not continue to run the engine if thelow oil pressure-alert indicator is on andthe engine oil level is lower. Serious en-gine damage will occur.

� The low oil pressure-alert indicator doesnot indicate the engine oil level. Use theoil dipstick to check the remaining oilquantity. For further information, seepage 39.

ZMU01740

ZMU01741



27

EMU26583

Overheat-alert indicatorIf the engine temperature rises too high, thealert indicator will start to blink. For further in-formation on reading the indicator, see page33.

NOTICEECM00052

Do not continue to run the engine if theoverheat-alert indicator is on. Serious en-gine damage will occur.

EMU26602

Digital speedometerThis gauge shows the boat speed and otherinformation.

All segments of the display will light momen-tarily after the main switch is turned on andwill return to normal thereafter.EMU36061

SpeedometerThe speedometer displays km/h, mph, orknots, according to operator preference. Se-lect the desired units of measurement by set-ting the selector switch on the back of thegauge. See the illustration for settings.

EMU26712

Fuel gaugeEight segments indicate the fuel level. Whenall segments are showing, the fuel tank is full.

1. Low oil pressure-alert indicator

1. Overheat-alert indicator

ZMU017361

ZMU01737

1

1. Speedometer2. Fuel gauge3. Trip meter/clock/voltmeter4. Alert indicator(s)

1. Cap2. Selector switch (for speed unit)3. Selector switch (for fuel sensor)



28

The fuel level reading can be inaccurate dueto by the position of the sensor in the fuel tankand the attitude of the boat in the water. Oper-ation with bow-up trim or continuous turningcan give false readings.Do not adjust the selector switch for fuel sen-sor. Incorrectly setting the selector switch onthe gauge will give false readings. Consultyour Yamaha dealer on how to correctly setthe selector switch. NOTICE: Running out offuel can damage the engine. [ECM01770]

EMU36071

Trip meter / Clock / VoltmeterThe display shows either the trip meter, theclock, or the voltmeter.To change the display, press the “ ”(mode) button repeatedly until the indicator onthe face of the gauge points to “ ” (tripmeter), “ ” (clock), or “ ” (voltmeter).EMU26691

Trip meterThis gauge displays the distance the boat hastraveled since the gauge was last reset.The trip distance is shown in kilometers ormiles depending upon the unit of measure-ment selected for the speedometer.To reset the trip meter to zero, press the “ ”(set) and “ ” (mode) buttons at the sametime.The trip distance is kept in memory by batterypower. The stored data will be lost if the bat-tery is disconnected.

EMU26701

ClockTo set the clock:1. Be sure the gauge is in the “ ” (time)

mode.2. Press the “ ” (set) button; the hour dis-

play will begin blinking.3. Press the “ ” (mode) button until the

desired hour is displayed.4. Press the “ ” (set) button again, the

minute display will begin blinking.5. Press the “ ” (mode) button until the

desired minute is displayed.6. Press the “ ” (set) button again to start

the clock.

The clock operates on battery power. Discon-necting the battery will stop the clock. Resetthe clock after connecting the battery.EMU36080

VoltmeterThe voltmeter displays the charge of the bat-tery in volts(V).

ZMU01745



29

EMU26721

Fuel level-alert indicatorIf the fuel level decreases to one segment, thefuel level alert segment will blink.Do not continue to operate the engine with fullthrottle if an alert device has activated. Getback to the port within trolling engine speed.NOTICE: Running out of fuel can damagethe engine. [ECM01770]

EMU26732

Low battery voltage-alert indicatorIf battery voltage drops, the display will auto-matically turn on and blink.Get back to the port soon if an alert device hasactivated. For charging the battery, consultyour Yamaha dealer.

EMU31653

6Y8 Multifunction metersMultifunction meters have 6 kinds of meterunits; tachometer unit (square or roundtypes), speedometer unit (square type),

speed & fuel meter unit (square or roundtypes), and fuel management meter (squaretype). The indicator system is slightly differentbetween the round and square types. Checkthe model and type of your unit carefully. Thismanual describes mainly the alert indicators.For more details on setting meters or chang-ing indicator systems, see the attached oper-ation manual.EMU36184

6Y8 Multifunction tachometersThe tachometer shows the engine revolutionsper minute. It has functions of trim meter, ad-justing trolling speed, cooling water/enginetemperature display, battery voltage display,total hour/trip hour display, oil pressure dis-play, water detection alert, engine troublealert, and periodic maintenance notification. Ifthe cooling water pressure sensor is installed,the unit can also show the cooling water pres-sure display. However, even if the cooling wa-ter pressure sensor is not installed, thecooling water pressure display can be shownby connecting an optional sensor to the unit.For the optional sensor, consult your Yamahadealer. The tachometer unit is available inround or square types. Check your tachome-ter unit type.

1. Fuel level-alert segment

1. Low battery indicator

1. Set button2. Mode button

21

ZMU05415



30

EMU36190

Start-up checksPlace the remote control lever / gear shift le-ver in neutral and turn the main switch to “ ”(on). After all the displays come on and the to-tal hour display comes on, the gauge willchange to normal operation. If the buzzersounds and the water separator-alert indica-tor blinks, consult your Yamaha dealer imme-diately.

TIP:To stop the buzzer, press the “ ” (set) or“ ” (mode) button.EMU36130

Low oil pressure-alertIf the engine oil pressure drops too low, thelow oil pressure-alert indicator will start toblink, and the engine speed will automaticallydecrease to about 2000 r/min.

Stop the engine immediately if the buzzersounds and the low oil pressure-alert indicatorblinks. Check the engine oil quantity and re-plenish oil if necessary. If the alert device hasactivated while the appropriate engine oilquantity is maintained, consult your Yamahadealer.

NOTICEECM01601

Do not continue to run the engine if thelow oil pressure alert device has activated.Serious engine damage will occur.

EMU36221

Overheat alertIf the engine temperature rises too high whilecruising, the overheat-alert indicator will startto blink. The engine speed will automaticallydecrease to about 2000 r/min.

1. Tachometer2. Trim meter3. Multifunction display4. Cooling water pressure5. Cooling water/engine temperature6. Water detection-alert indicator7. Battery voltage8. Oil pressure (4-stroke models)

2

3

1

4

5

6

7

8 ZMU05416 ZMU05430

ZMU05421



31

Stop the engine immediately if the buzzersounds and the overheat alert device has ac-tivated. Check the cooling water inlet for clog-ging.

NOTICEECM01592

� Do not continue to run the engine if theoverheat-alert indicator blinks. Seriousengine damage will occur.

� Do not continue to operate the engine ifa alert device has activated. Consultyour Yamaha dealer if the problem can-not be located and corrected.

EMU36150

Water separator alertThis indicator will blink if water has accumulat-ed in the water separator (fuel filter) whilecruising. In such an event, stop the engine im-mediately and see page 76 of this manual todrain the water from the fuel filter. Get back tothe port soon and consult a Yamaha dealerimmediately.

NOTICEECM00910

Gasoline mixed with water could causedamage to the engine.

EMU36160

Engine trouble alertThis indicator will blink if the engine malfunc-tions while cruising. Get back to the port soonand consult a Yamaha dealer immediately.

NOTICEECM00920

In such an event, the engine will not oper-ate properly. Consult a Yamaha dealer im-mediately.

EMU36170

Low battery voltage-alertIf the battery voltage drops, the low batteryvoltage-alert indicator and the battery voltagevalue will start to blink. Get back to the portsoon if the low battery voltage-alert devicehas activated. For charging the battery, con-sult your Yamaha dealer.

EMU36241

6Y8 Multifunction speedome-ters

The speedometer unit shows the boat speedand has functions of fuel meter and systemvoltage display. The chosen display is select-ed by using the “ ” (set) and “ ” (mode)buttons as described in this section. In addi-

ZMU05423

ZMU05425

ZMU05427



32

tion, the speedometer can show the desiredunit of measurement such as km/h, mph, orknots. If the speed sensor is installed, the unitcan also show the trip display. However, evenif the speed sensor is not installed, the trip dis-play can be shown by connecting an optionalsensor to the unit. In addition, if optional sen-sors are connected to the unit, water surfacetemperature display, depth display, and clockwill also be available. For the optional sen-sors, consult your Yamaha dealer.After the main switch is first turned on, all thedisplays come on as a test. After a few sec-onds, the gauge will change to normal opera-tion.For more information, see the operation man-ual originally supplied with the meter.

EMU36250

6Y8 Multifunction fuel manage-ment meters

The fuel management meter has the func-tions of fuel flow meter, total consumption dis-play, fuel economy display, and remainingfuel display. The chosen display is selectedby using the “ ” (set) and “ ” (mode)buttons as described in this section. For moreinformation, see the operation manual origi-nally supplied with the meter.After the main switch is first turned on, all thedisplays come on as a test. After a few sec-onds, the gauge will change to normal opera-tion.For more information, see the operation man-ual originally supplied with the meter.


1. Speedometer2. Fuel meter3. Multifunction display

21

ZMU05436

1

23

ZMU05437


1. Fuel flow meter2. Multifunction display

21

ZMU05438

1

2

ZMU05439


Engine control system

33

EMU26803

Alert system

NOTICEECM00091

Do not continue to operate the engine if aalert device has activated. Consult yourYamaha dealer if the problem cannot be lo-cated and corrected.

EMU2681A

Overheat alertThis engine has an overheat-alert device. Ifthe engine temperature rises too high, thealert device will activate.� The engine speed will automatically de-

crease to about 2000 r/min.� The overheat-alert indicator will light or

blink.

� The buzzer will sound (if equipped on thetiller handle, remote control box, or mainswitch panel).

If the alert system has activated, stop the en-gine and check the cooling water inlets:� Check trim angle to be sure that the cooling

water inlet is submerged.� Check the cooling water inlet for clogging.

EMU26857

Low oil pressure alertIf the oil pressure drops too low, the alert de-vice will activate.� The engine speed will automatically de-

crease to about 2000 r/min. The low oilpressure-alert indicator will light or blink.

ZMU01757

ZMU02630

ZMU01828


Engine control system

34

� The buzzer will sound.

If the alert system has activated, stop the en-gine as soon as it is safe to do so. Check theoil level and add oil as needed. If the oil levelis correct and the alert device does not switchoff, consult your Yamaha dealer.


Installation

35

EMU26902

InstallationThe information presented in this section is in-tended as reference only. It is not possible toprovide complete instructions for every possi-ble boat and motor combination. Propermounting depends in part on experience andthe specific boat and motor combination.

WARNINGEWM01590

� Overpowering a boat could cause se-vere instability. Do not install an out-board motor with more horsepower thanthe maximum rating on the capacityplate of the boat. If the boat does nothave a capacity plate, consult the boatmanufacturer.

� Improper mounting of the outboard mo-tor could result in hazardous conditionssuch as poor handling, loss of control,or fire hazards. For permanently mount-ed models, your dealer or other personexperienced in proper rigging shouldmount the motor.

EMU33470

Mounting the outboard motorThe outboard motor should be mounted sothat the boat is well balanced. Otherwise, theboat could be hard to steer. For single-engineboats, mount the outboard motor on the cen-terline (keel line) of the boat.

EMU26932

Mounting height (boat bottom)The mounting height of your outboard motoraffects its efficiency and reliability. If it ismounted too high, propeller ventilation mayoccur, which will reduce propulsion due to ex-cessive propeller slip, and the water intakesfor the cooling system may not get adequatewater supply, which can cause engine over-heating. If the engine is mounted too low, wa-ter resistance (drag) will increase, therebyreducing engine efficiency and performance.Most commonly, outboard motor should bemounted so that the anti-cavitation plate is inalignment with the bottom of the boat. The op-timum mounting height of the outboard motoris affected by the boat/motor combination andthe desired use. Test runs at different heightscan help determine the optimum mountingheight. Consult your Yamaha dealer or boatmanufacturer for further information on deter-mining the proper mounting height.

NOTICEECM01631

� Check that the idle hole stays highenough to keep out water getting insideengine even if the boat is in stationarywith maximum load.

� Incorrect engine height or obstructionsto the smooth flow of water (such as thedesign or condition of the boat, or ac-cessories such as transom ladders or1. Center line (keel line)

ZMU017601

ZMU01762


Installation

36

depth finder transducers) can create air-borne water spray while the boat iscruising. If the motor is operated contin-uously in the presence of airborne waterspray, enough water could enter the en-gine through the intake opening on thecowling to cause severe engine dam-age. Eliminate the cause of the airbornewater spray.


Operation

37

EMU36380

First-time operationEMU36390

Fill engine oilThe engine is shipped from the factory withoutengine oil. If your dealer did not fill the oil, youmust fill it before starting the engine. NOTICE:Check that the engine is filled with oil be-fore first-time operation to avoid severeengine damage. [ECM01780]

The engine is shipped with the following stick-er, which should be removed after engine oilis filled for the first time. For more informationon checking the engine oil level, see page 39.

EMU30174

Breaking in engineYour new engine requires a period of break-into allow mating surfaces of moving parts towear in evenly. Correct break-in will help en-sure proper performance and longer enginelife. NOTICE: Failure to follow the break-inprocedure could result in reduced enginelife or even severe engine damage. [ECM00801]

EMU27084

Procedure for 4-stroke modelsYour new engine requires a period of 10hours break-in to allow mating surfaces ofmoving parts to wear in evenly. Correct break-in will help ensure proper performance andlonger engine life.

TIP:Failure to follow the break-in procedure couldresult in reduced engine life or even severeengine damage. Run the engine in the water,under load (in gear with a propeller installed)as follows. For ten hours for breaking in en-gine avoid extended idling, rough water andcrowded areas.1. For the first hour of operation:

Run the engine at varying speeds up to2000 r/min or approximately half throttle.

2. For the second hour of operation:Increase engine speed as much as nec-essary to put the boat on plane (but avoidfull-throttle operation), then back off onthe throttle while keeping the boat at aplaning speed.

3. Remaining eight hours:Run the engine at any speed. However,avoid operating at full throttle for morethan 5 minutes at a time.

4. After the first 10 hours:Operate the engine normally.

EMU36400

Getting to know your boatDifferent boats handle differently. Operatecautiously while you learn how your boat han-dles under different conditions and with differ-ent trim angles (see page 49).EMU36412

Checks before starting engine

WARNINGEWM01920

If any item in the checks before startingengine is not working properly, have it in-spected and repaired before operating theoutboard motor. Otherwise an accidentcould occur.

ZMU01710


Operation

38

NOTICEECM00120

Do not start the engine out of water. Over-heating and serious engine damage canoccur.

EMU36420

Fuel levelBe sure you have plenty of fuel for your trip. Agood rule is to use 1/3 of your fuel to get to thedestination, 1/3 to return, and to keep 1/3 asan emergency reserve. With the boat level ona trailer or in the water, turn the key to“ ”(on) and check the fuel level. For fuel fill-ing instructions, see page 41.EMU36431

Remove cowlingFor the following checks, remove the topcowling from the engine. To remove the en-gine cowling, release all the lock levers and liftoff the cowling.

EMU36442

Fuel system

WARNINGEWM00060

Gasoline and its vapors are highly flam-mable and explosive. Keep away fromsparks, cigarettes, flames, or other sourc-es of ignition.

WARNINGEWM00910

Leaking fuel can result in fire or explosion.� Check for fuel leakage regularly.� If any fuel leakage is found, the fuel sys-

tem must be repaired by a qualified me-chanic. Improper repairs can make theoutboard unsafe to operate.

EMU36450

Check for fuel leaks� Check under top cowling and in the boat for

fuel leaks or gasoline fumes.� Check fuel line connections to be sure they

are tight.� Check fuel lines for cracks, swelling, or oth-

er damage.EMU37320

Check the fuel filterCheck that the fuel filter is clean and free ofwater. If any water is found in the fuel, or if asignificant amount of debris is found, the fueltank should be checked and cleaned by aYamaha dealer.

ZMU06106

ZMU06107


Operation

39

EMU36900

ControlsTiller handle models:� Turn the tiller handle fully to the left and

right to make sure operation is smooth.� Turn the throttle grip from the fully closed to

the fully open position. Make sure that itturns smoothly and that it completely re-turns to the fully closed position.

� Look for loose or damaged connections ofthe throttle and shift cables under the en-gine cowling.

Remote control models:� Turn the steering wheel full-right and full-

left. Make sure operation is smooth and un-restricted throughout the whole range withno binding or excessive free play.

� Operate the throttle levers several times tomake sure there is no hesitation in theirtravel. Operation should be smooth overthe complete range of motion, and each le-ver should return completely to the idle po-sition.

� Look for loose or damaged connections ofthe throttle and shift cables under the en-gine cowling.

EMU36481

Engine shut-off cord (lanyard)Inspect the engine shut-off cord for damage,such as cuts, breaks, and wear.

EMU37051

Engine oil1. Put the outboard motor in an upright po-

sition (not tilted). NOTICE: If the motoris not level, the oil level indicated onthe dipstick may not be accurate.[ECM01790]

2. Remove the top cowling.3. Remove oil dipstick and wipe it clean.4. Insert the dipstick and remove it again.

Be sure to completely insert the dipstickinto the dipstick guide, otherwise the oillevel measurement will be incorrect.

5. Check the oil level using the dipstick to besure the level falls between the upper lev-el mark and lower level mark. Consultyour Yamaha dealer if the oil level is outof specified level or if it appears milky ordirty.




Operation

40

EMU27152

Engine� Check the engine and engine mounting.� Look for loose or damaged fasteners.� Check the propeller for damage.� Check for engine oil leaks.EMU36490

Flushing deviceCheck that flushing device’s garden hoseconnector is securely screwed on to the fittingon the bottom cowling. NOTICE: If the flush-ing device is not properly connected, cool-ing water can leak out and the engine canoverheat during operation. [ECM01800]

EMU36961

Install cowling1. Be sure that all cowling lock levers are re-

leased.2. Be sure that the rubber seal is seated all

the way around the engine.3. Place the cowling on top of the seal.4. Check to be sure the rubber seal fits cor-

rectly all the way around the engine.5. Move the levers to lock the cowling as

shown. NOTICE: If the cowling is notinstalled correctly, water spray underthe cowling can damage the engine, orthe cowling can blow off at highspeeds. [ECM01990]

1. Oil dipstick

1. Lower level mark2. Oil dipstick3. Upper level mark

ZMU05368

1

1. Fitting2. Flushing device

ZMU06166

1 2

ZMU06131


Operation

41

After installing, check the fitting of the topcowling by pushing it with both hands. If thetop cowling is loose, have it repaired by yourYamaha dealer.

EMU34581

Power trim and tilt system

WARNINGEWM01930

� Never get under the lower unit while it istilted, even when the tilt support lever islocked. Severe injury could occur if theoutboard motor accidentally falls.

� Body parts can be crushed between themotor and the clamp bracket when themotor is trimmed or tilted.

� Be sure no one is near the outboard mo-tor before performing this check.

1. Check the power trim and tilt unit for anysign of oil leaks.

2. Operate each of the power trim and tiltswitches to check that all switches work.

3. Tilt the outboard motor up and check thatthe trim and tilt rod is pushed out com-pletely.

4. Check that the trim and tilt rod is free ofcorrosion or other flaws.

5. Tilt the outboard motor down. Check thatthe trim and tilt rod operates smoothly.

EMU36581

BatteryCheck that the battery is in good condition,and fully charged. Check that the battery con-nections are clean, secure and covered by in-sulating covers. The electrical contacts of thebattery and cables must be clean and proper-ly connected or the battery will not start theengine.Refer to the battery manufacturer’s instruc-tions for checks for your particular battery.EMU27436

Filling fuel

WARNINGEWM01830

� Gasoline and its vapors are highly flam-mable and explosive. Always refuel ac-cording to this procedure to reduce therisk of fire and explosion.

� Gasoline is poisonous and can cause in-jury or death. Handle gasoline with care.Never siphon gasoline by mouth. If youshould swallow some gasoline or inhalea lot of gasoline vapor, or get some gas-

ZMU06132

1. Trim and tilt rod

1

ZMU04244


Operation

42

oline in your eyes, see your doctor im-mediately. If gasoline spills on yourskin, wash with soap and water. If gaso-line spills on your clothing, change yourclothes.

1. Stop the engine.2. Remove the portable tank from the boat.3. Be sure you are in a well-ventilated out-

door area, either securely moored or trail-ered.

4. Do not smoke and keep away fromsparks, flames, static electric discharge,or other sources of ignition.

5. If you use a portable container to storeand dispense fuel, use only an approvedGASOLINE container.

6. Touch the fuel nozzle to the filler openingor funnel to help prevent electrostaticsparks.

7. Fill the fuel tank, but do not overfill. Fuelcan expand and overflow if the tempera-ture increases.

8. Tighten the filler cap securely.9. Wipe up any spilled gasoline immediately

with dry rags. Dispose rags properly. Ac-cording to local laws or regulations.

EMU27451

Operating engineEMU27465

Sending fuel (portable tank)

WARNINGEWM00420

� Before starting the engine, make surethat the boat is tightly moored and thatyou can steer clear of any obstructions.Be sure there are no swimmers in thewater near you.

� When the air vent screw is loosened,gasoline vapor will be released. Gaso-line is highly flammable, and its vaporsare flammable and explosive. Refrainfrom smoking, and keep away fromopen flames and sparks while looseningthe air vent screw.

� This product emits exhaust gases whichcontain carbon monoxide, a colorless,odorless gas which could cause braindamage or death when inhaled. Symp-toms include nausea, dizziness, anddrowsiness. Keep cockpit and cabin ar-eas well ventilated. Avoid blocking ex-haust outlets.

1. If there is an air vent screw on the fueltank cap, loosen it 2 or 3 turns.

Fuel tank capacity:24.0 L (6.34 US gal, 5.28 Imp.gal)

ZMU02834

ZMU02295


Operation

43

2. If there is a fuel joint on the motor, firmlyconnect the fuel line to the joint. Thenfirmly connect the other end of the fuelline to the joint on the fuel tank.

3. Squeeze the primer pump, with the arrowpointing up, until you feel it become firm.During engine operation place the tankhorizontally, otherwise fuel cannot bedrawn from the fuel tank.

EMU27493

Starting engine

WARNINGEWM01600

Before starting the engine, make sure thatthe boat is tightly moored and that you cansteer clear of any obstructions. Be surethere are no swimmers in the water nearyou.

EMU27595

Electric start / prime start models

WARNINGEWM01840

� Failure to attached engine shut-off cordcould result in a runaway boat if opera-tor is ejected. Attach the engine shut-offcord to a secure place on your clothing,or your arm or leg while operating. Donot attach the cord to clothing that couldtear loose. Do not route the cord whereit could become entangled, preventing itfrom functioning.

� Avoid accidentally pulling the cord dur-ing normal operation. Loss of enginepower means the loss of most steeringcontrol. Also, without engine power, theboat could slow rapidly. This couldcause people and objects in the boat tobe thrown forward.

1. Place the gear shift lever in neutral.

TIP:The start-in-gear protection device preventsthe engine from starting except when in neu-tral.2. Attach the engine shut-off cord to a se-

cure place on your clothing, or your armor leg. Then install the clip on the otherend of the cord into the engine shut-offswitch.

1. Arrow

ZMU02024


Operation

44

3. Place the throttle grip in the “ ”(start) position. After the engine starts, re-turn the throttle to the fully closed posi-tion.

4. Turn the main switch to “ ” (start),and hold it for a maximum of 5 seconds.

5. Immediately after the engine starts, re-lease the main switch and allow it to re-turn to “ ” (on). NOTICE: Never turnthe main switch to “ ” (start)while the engine is running. Do not

keep the starter motor turning formore than 5 seconds. If the starter mo-tor is turned continuously for morethan 5 seconds, the battery will bequickly discharged, thus making it im-possible to start the engine. The start-er can also be damaged. If the enginewill not start after 5 seconds of crank-ing, return the main switch to “ ”(on), wait 10 seconds, then crank theengine again. [ECM00192]

TIP:� When the engine is cold, it needs to be

warmed up. For further information, seepage 46.

� If the engine is warm and fails to start, openthe throttle slightly and try to start the en-gine again. If the engine still fails to start,see page 73.

EMU27628

Electric start and remote control models

WARNINGEWM01840

� Failure to attached engine shut-off cordcould result in a runaway boat if opera-tor is ejected. Attach the engine shut-offcord to a secure place on your clothing,or your arm or leg while operating. Donot attach the cord to clothing that couldtear loose. Do not route the cord whereit could become entangled, preventing itfrom functioning.


1. Place the remote control lever in “ ”(neutral).


Operation

45

TIP:The start-in-gear protection device preventsthe engine from starting except when in neu-tral.

2. Attach the engine shut-off cord to a se-cure place on your clothing, or your armor leg. Then install the clip on the otherend of the cord into the engine shut-offswitch.

3. Turn the main switch to “ ” (on).

TIP:Dual engine users: When the main switch isturned on, the buzzer operates for a few sec-onds then stops automatically. The buzzeralso operates if one of the engines stalls.

4. Turn the main switch to “ ” (start),and hold it for a maximum of 5 seconds.

5. Immediately after the engine starts, re-lease the main switch to return it to “ ”(on). NOTICE: Never turn the mainswitch to “ ” (start) while the en-gine is running. Do not keep the start-er motor turning for more than 5seconds. If the starter motor is turnedcontinuously for more than 5 sec-onds, the battery will be quickly dis-charged, thus making it impossible tostart the engine. The starter can alsobe damaged. If the engine will not startafter 5 seconds of cranking, return themain switch to “ ” (on), wait 10 sec-onds, then crank the engine again.[ECM00192]

ON STARTOFF

ZMU01881


Operation

46

EMU36510

Checks after starting engineEMU36520

Cooling waterCheck for a steady flow of water from the cool-ing water pilot hole. A continuous flow of waterfrom the pilot hole shows that the water pumpis pumping water through the cooling passag-es. If the cooling passages are frozen, it maytake a while for water to start flowing out of thepilot hole.

NOTICEECM01810

If water is not flowing out of the pilot holeat all times while the engine is running,overheating and serious damage couldoccur. Stop the engine and check whetherthe cooling water inlet on the lower case orthe cooling water pilot hole is blocked.Consult your Yamaha dealer if the prob-lem cannot be located and corrected.

Check that no water leaks from the joints be-tween the exhaust cover, cylinder head, andbody cylinder.

EMU27670

Warming up engineEMU30036

Electric start models1. After starting the engine, allow it to idle for

3 minutes to warm up to provide maxi-mum operating performance and accel-eration. Failure to do so will shortenengine life.

2. Be sure the low oil pressure-alert indica-tor remains off after starting the engine.NOTICE: If the low oil pressure-alertindicator blinks after the engine starts,stop the engine. Otherwise seriousengine damage could occur. Checkthe oil level and add oil if necessary.Consult your Yamaha dealer if thecause for the low oil pressure-alert in-dicator cannot be found. [ECM01830]

EMU36530

Checks after engine warm-upEMU36540

ShiftingWhile tightly moored, and without applyingthrottle, confirm that the engine shifts smooth-ly into forward and reverse, and back to neu-tral.EMU36980

Stop switches� Turn the main switch to “ ”, or press the

engine stop button and make sure the en-gine stops.

� Confirm that removing the clip from the en-gine shut-off switch stops the engine.

� Confirm that the engine cannot be startedwith the clip removed from the engine shut-off switch.


Operation

47

EMU34490

Shifting

WARNINGEWM00180

Before shifting, make sure there are noswimmers or obstacles in the water nearyou.

NOTICEECM01610

Warm up the engine before shifting intogear. Until the engine is warm, the idlespeed may be higher than normal. Highidle speed can prevent you from shiftingback to neutral. If this occurs, stop the en-gine, shift to neutral, then restart the en-gine and allow it to warm up.

To shift out of neutral1. Pull the neutral interlock trigger up (if

equipped).

2. Move the remote control lever / gear shiftlever firmly and crisply forward (for for-ward gear) or backward (for reversegear) [about 35° (a detent can felt) for re-mote control models].

TIP:Tiller handle models: The gear shift lever op-erates only when the throttle grip is in the fullyclosed position.To shift from in gear (forward/reverse) to neu-tral1. Close the throttle so that the engine

slows to idle speed.

1. Neutral interlock trigger


Operation

48

2. After the engine is at idle speed in gearmove the remote control lever / gear shiftlever firmly and crisply into the neutral po-sition.

EMU31742

Stopping boat

WARNINGEWM01510

� Do not use the reverse function to slowdown or stop the boat as it could causeyou to lose control, be ejected, or impact

the steering wheel or other parts of theboat. This could increase the risk of se-rious injury. It could also damage theshift mechanism.

� Do not shift into reverse while travelingat planing speeds. Loss of control, boatswamping, or damage to the boat couldoccur.

The boat is not equipped with a separatebraking system. Water resistance stops it af-ter the throttle lever is moved back to idle. Thestopping distance varies depending on grossweight, water surface conditions, and wind di-rection.EMU30880

TrollingEMU30890

Adjusting trolling speedThe trolling speed on outboard motorsequipped with the variable trolling RPMswitches can be adjusted approximately 50r/min with each press of a switch.

To increase the trolling speed, press the “ ”switch.To decrease the trolling speed, press the “ ”switch.

TIP:� The trolling speed changes approximately

50 r/min each time a switch is pressed.

1. “ ” switch2. “ ” switch


Operation

49

� If the trolling speed has been adjusted, theengine returns to the normal trolling speedwhen the engine is stopped and restartedor when the engine speed exceeds approx-imately 3000 r/min.

EMU27821

Stopping engineBefore stopping the engine, first let it cool offfor a few minutes at idle or low speed. Stop-ping the engine immediately after operating athigh speed is not recommended.EMU27845

Procedure1. Push and hold the engine stop button or

turn the main switch to “ ” (off).

2. After stopping the engine, disconnect thefuel line if there is a fuel joint on the out-board motor.

3. Tighten the air vent screw on the fuel tankcap (if equipped).

4. Remove the key if the boat will be left un-attended.

TIP:The engine can also be stopped by pulling thecord and removing the clip from the engineshut-off switch, then turning the main switchto “ ” (off).EMU27862

Trimming outboard motor

WARNINGEWM00740

Excessive trim for the operating condi-tions (either trim up or trim down) cancause boat instability and can make steer-ing the boat more difficult. This increasesthe possibility of an accident. If the boatbegins to feel unstable or is hard to steer,slow down and/or readjust the trim angle.

The trim angle of the outboard motor helpsdetermine the position of the bow of the boatin the water. Correct trim angle will help im-prove performance and fuel economy whilereducing strain on the engine. Correct trim an-gle depends upon the combination of boat,


Operation

50

engine, and propeller. Correct trim is also af-fected by variables such as the load in theboat, sea conditions, and running speed.

EMU27885

Adjusting trim angle (Power trim and tilt)

WARNINGEWM00753

� Be sure all people are clear of the out-board motor when adjusting the trim an-gle. Body parts can be crushed betweenthe motor and the clamp bracket whenthe motor is trimmed or tilted.

� Use caution when trying a trim positionfor the first time. Increase speed gradu-ally and watch for any signs of instabilityor control problems. Improper trim an-gle can cause loss of control.

� If equipped with a power trim and tiltswitch located on the bottom cowling,use the switch only when the boat is at a

complete stop with the engine off. Donot adjust the trim angle with this switchwhile the boat is moving.

Adjust the outboard motor trim angle usingthe power trim and tilt switch.

To raise the bow (trim-out), press the switch“ ” (up).

1. Trim operating angle

1ZMU04258




UP

DN

1

ZMU04231


Operation

51

To lower the bow (trim-in), press the switch“ ” (down).Make test runs with the trim set to different an-gles to find the position that works best foryour boat and operating conditions.EMU27911

Adjusting boat trimWhen the boat is on plane, a bow-up attituderesults in less drag, greater stability and effi-ciency. This is generally when the keel line ofthe boat is up about 3 to 5 degrees. With thebow up, the boat may have a greater tenden-cy to steer to one side or the other. Compen-sate for this as you steer. The trim tab canalso be adjusted to help offset this effect.When the bow of the boat is down, it is easierto accelerate from a standing start onto plane.

Bow UpToo much trim-out puts the bow of the boattoo high in the water. Performance and econ-omy are decreased because the hull of theboat is pushing the water and there is more airdrag. Excessive trim-out can also cause thepropeller to ventilate, which reduces perfor-mance further, and the boat may “porpoise”(hop in the water), which could throw the op-erator and passengers overboard.

Bow DownToo much trim-in causes the boat to “plow”through the water, decreasing fuel economyand making it hard to increase speed. Operat-ing with excessive trim-in at higher speedsalso makes the boat unstable. Resistance atthe bow is greatly increased, heightening thedanger of “bow steering” and making opera-tion difficult and dangerous.

TIP:Depending on the type of boat, the outboardmotor trim angle may have little effect on thetrim of the boat when operating.EMU27934

Tilting up and downIf the engine will be stopped for some time orif the boat is moored in shallows, the outboardmotor should be tilted up to protect the propel-ler and lower casing from damage by collisionwith obstructions, and also to reduce salt cor-rosion.


Operation

52

WARNINGEWM00221

Be sure all people are clear of the out-board motor when tilting up and down,Body parts can be crushed between themotor and the clamp bracket when the mo-tor is trimmed or tilted.

WARNINGEWM00250

Leaking fuel is a fire hazard. If there is afuel joint on the outboard motor, discon-nect the fuel line or close the fuel cock ifthe engine will be tilted for more than a fewminutes. Otherwise fuel may leak.

NOTICEECM00241

� Before tilting the outboard motor, stopthe engine by following the procedureon page 49. Never tilt the outboard mo-tor while the engine is running. Severedamage from overheating can result.

� Do not tilt up the engine by pushing thetiller handle (if equipped) because thiscould break the handle.

EMU32723

Procedure for tilting up (power trim and tilt models)1. Place the remote control lever / gear shift

lever in neutral.

2. Press the power trim and tilt switch “ ”(up) until the outboard motor has tilted upcompletely.

N

ZMU03196


Operation

53

3. Pull the tilt support lever toward you tosupport the engine. WARNING! Aftertilting the outboard motor, be sure tosupport it with the tilt support knob ortilt support lever. Otherwise the out-board motor could fall back down sud-denly if oil in the power trim and tiltunit or in the power tilt unit loses pres-sure. [EWM00262] NOTICE: Do not use thetilt support lever or knob when traile-ring the boat. The outboard motorcould shake loose from the tilt supportand fall. If the motor cannot be trail-ered in the normal running position,use an additional support device tosecure it in the tilt position. For moredetailed information, see page 56.[ECM01641]

4. Models equipped with trim rods: Once theoutboard motor is supported with the tiltsupport lever, press the power trim and

tilt switch “ ” (down) to retract the trimrods. NOTICE: Be sure to retract thetrim rods completely during mooring.This protects the rods from marinegrowth and corrosion which coulddamage the power trim and tilt mecha-nism. [ECM00251]

EMU33120

Procedure for tilting down (power trim and tilt models)1. Push the power trim and tilt switch “ ”

(up) until the outboard motor is supportedby the tilt rod and the tilt support lever be-comes free.

2. Release the tilt support lever.

3. Push the power trim and tilt switch “ ”(down) to lower the outboard motor to thedesired position.

UP

ZMU04232

DN

ZMU01936

UP

DN


Operation

54

EMU28061

Shallow waterEMU32851

Power trim and tilt modelsThe outboard motor can be tilted up partiallyto allow operation in shallow water.

NOTICEECM00260

Do not tilt the outboard motor up so thatthe cooling water inlet on the lower unit isabove the surface of the water when set-ting up for and cruising in shallow water.Otherwise severe damage from overheat-ing can result.

EMU32912

Procedure for power trim and tilt models1. Place the remote control lever / gear shift

lever in neutral.

2. Slightly tilt the outboard motor up to thedesired position using the power trim andtilt switch. WARNING! Using the powertrim and tilt switch on the bottomcowling while the boat is moving orengine is on could increase the risk offalling overboard and could distractthe operator, increasing the risk ofcollision with another boat or an ob-stacle. [EWM01850]

DN

ZMU04255


Operation

55

3. To return the outboard motor to the nor-mal running position, press the powertrim and tilt switch and slowly tilt the out-board motor down.

EMU28194

Cruising in other conditionsCruising in salt waterAfter operating in salt water, flush the coolingwater passages with fresh water to preventthem from becoming clogged. Also rinse theoutside of the outboard motor with fresh waterand, if possible, rinse the power head underthe cowling.Cruising in muddy, turbid, or acidic waterYamaha strongly recommends that you usethe optional chromium-plated water pump kit(see page 13) if you use the outboard motor inacidic water or water with a lot of sediment init, such as muddy or turbid (cloudy) water. Af-ter operating in such water, flush the coolingpassages with fresh water to prevent corro-sion. Also rinse the outside of the outboardmotor with fresh water.


Maintenance

56

EMU28226

Transporting and storing out-board motor

WARNINGEWM00692

� USE CARE when transporting fuel tank,whether in a boat or car.

� DO NOT fill fuel container to maximumcapacity. Gasoline will expand consider-ably as it warms up and can build uppressure in the fuel container. This cancause fuel leakage and a potential firehazard.

WARNINGEWM01860

Leaking fuel is a fire hazard. When trans-porting and storing the outboard motor,close the fuel cock to prevent fuel fromleaking. Never get under the engine whileit is tilted. Severe injury could occur if theoutboard motor accidentally falls.

NOTICEECM00660

Do not use the tilt support lever or knobwhen trailering the boat. The outboard mo-tor could shake loose from the tilt supportand fall. If the motor cannot be trailered inthe normal running position, use an addi-tional support device to secure it in the tiltposition.

The outboard motor should be trailered andstored in the normal running position. If thereis insufficient road clearance in this position,then trailer the outboard motor in the tilt posi-tion using a motor support device such as atransom saver bar. Consult your Yamahadealer for further details.

EMU30041

Storing outboard motorWhen storing your Yamaha outboard motorfor prolonged periods of time (2 months orlonger), several important procedures mustbe performed to prevent excessive damage. Itis advisable to have your outboard motor ser-viced by an authorized Yamaha dealer prior tostorage. However, you, the owner, with a min-imum of tools, can perform the following pro-cedures.

NOTICEECM01350

� To prevent problems which can becaused by oil entering the cylinder fromthe sump, keep the outboard motor inthe attitude shown when transportingand storing it. Do not store or transportthe outboard motor on its side (not up-right).

� Do not place the outboard motor on itsside before the cooling water hasdrained from it completely, otherwisewater may enter the cylinder through theexhaust port and cause engine trouble.

� Store the outboard motor in a dry, well-ventilated place, not in direct sunlight.

� Drain the remaining gasoline from thevapor separator. Gasoline left in the va-por separator for a prolonged period oftime will break down and could causedamage to the fuel line.


Maintenance

57

EMU28304

ProcedureEMU29955

Flushing with the flushing attachment1. Wash the outboard motor body using

fresh water. NOTICE: Do not spray wa-ter into the air intake. [ECM01840] For furtherinformation, see page 59.

2. Disconnect the fuel line from the motor orshut off the fuel cock, if equipped.

3. Remove the top cowling and propeller.4. Install the flushing attachment over the

cooling water inlet. NOTICE: Do not runthe engine without supplying it withcooling water. Either the engine waterpump will be damaged or the enginewill be damaged from overheating. Be-fore starting the engine, be sure tosupply water to the cooling water pas-sages. Avoid running the outboardmotor at high speed while on theflushing attachment, otherwise over-heating could occur. [ECM02000]

5. Cooling system flushing is essential toprevent the cooling system from cloggingup with salt, sand, or dirt. In addition, fog-ging/lubricating the engine is mandatoryto prevent excessive engine damage dueto rust. Perform the flushing and foggingat the same time. WARNING! Do nottouch or remove electrical parts whenstarting or during operation. Keephands, hair, and clothes away fromthe flywheel and other rotating partswhile the engine is running. [EWM00091]

TIP:� When using the flushing attachment, main-

tain adequate water pressure and a steadywater flow.

� If the overheat alert device is activated, turnthe engine off, and consult your Yamahadealer.

6. Run the engine at a fast idle for a fewminutes in neutral position.

7. Just prior to turning off the engine, quicklyspray “Fogging Oil” alternately into the in-take silencer or the fogging hole of the si-lencer cover, if equipped. When properlydone, the engine will smoke excessivelyand almost stall.

8. Drain the remained gasoline in the vaporseparator with a container. Loosen thedrain screw, and then remove the cap.

ZMU03659

1. Flushing attachment


Maintenance

58

Push in the air valve with a screwdriver tointroduce air into the float chamber, sothat the gasoline will drain smoothly.Then, tighten the drain screw.

9. Remove the flushing attachment.10. Install the top cowling.

11. If “Fogging Oil” is not available, turn offthe engine after the 6 step. Then performthe 8 step procedure.

12. Drain the cooling water completely out ofthe motor. Clean the body thoroughly.

13. If the “Fogging Oil” is not available, re-move the spark plug(s). Pour a teaspoon-ful of clean engine oil into each cylinder.Crank several times manually. Replacethe spark plug(s).

TIP:A flushing attachment is available from yourYamaha dealer.EMU28402

Lubrication1. Install the spark plug(s) and torque to

proper specification. For information onspark plug installation, see page 65.

2. Change the gear oil. For instructions, seepage 69. Inspect the oil for the presenceof water that indicates a leaky seal. Sealreplacement should be performed by anauthorized Yamaha dealer prior to use.

3. Grease all grease fittings. For further de-tails, see page 64.

TIP:For long-term storage, fogging the enginewith oil is recommended. Contact yourYamaha dealer for information about foggingoil and procedures for your engine.EMU28443

Flushing power unitPerform this procedure right after operationfor the most thorough flushing.

NOTICEECM01530

Do not perform this procedure while theengine is running. The water pump may bedamaged and severe damage from over-heating can result.

1. Vapor separator2. Drain screw3. Cap

1. Air valve


Maintenance

59

1. After shutting off the engine, unscrew thegarden hose connector from the fitting onthe bottom cowling.

2. Screw the garden hose adapter onto agarden hose, which is connected to afresh water supply, and then connect it tothe garden hose connector.

3. With the engine off, turn on the water tapand let the water flush through the cool-ing passages for about 15 minutes. Turnoff the water and disconnect the gardenhose adapter from the garden hose con-nector.

4. Reinstall the garden hose connector ontothe fitting on the bottom cowling. Tightenthe connector securely. NOTICE: Do notleave the garden hose connectorloose on the bottom cowling fitting orlet the hose hang free during normal

operation. Water will leak out of theconnector instead of cooling the en-gine, which can cause serious over-heating. Be sure the connector istightened securely on the fitting afterflushing the engine. [ECM00541]

TIP:� When flushing the engine with the boat in

the water, tilting up the outboard motor untilit is completely out of the water will achievebetter results.

� For cooling system flushing instructions,see page 56.

EMU28450

Cleaning the outboard motorAfter use, wash the exterior of the outboardmotor with fresh water. Flush the cooling sys-tem with fresh water.

TIP:For cooling system flushing instructions, seepage 56.EMU28460

Checking painted surface of motorCheck the motor for scratches, nicks, or flak-ing paint. Areas with damaged paint are morelikely to corrode. If necessary, clean and paintthe areas. A touch-up paint is available fromyour Yamaha dealer.

1. Fitting2. Garden hose adapter3. Garden hose connector

ZMU04265


Maintenance

60

EMU2850B

Periodic maintenance

WARNINGEWM01871

These procedures require mechanicalskills, tools, and supplies. If you do nothave the proper skills, tools, or supplies toperform a maintenance procedure, have aYamaha dealer or other qualified mechan-ic do the work.The procedures involve disassemblingthe motor and exposing dangerous parts.To reduce the risk of injury from moving,hot, or electrical parts:� Turn off the engine and keep the key(s)

and engine shut-off cord (lanyard) withyou when you perform maintenance un-less otherwise specified.

� The power trim and tilt switches operateeven when the ignition key is off. Keeppeople away from the switches whenev-er working around the motor. When themotor is tilted, keep away from the areaunder it or between it and the clampbracket. Be sure no one is in this areabefore operating the power trim and tiltmechanism.

� Allow the engine to cool before handlinghot parts or fluids.

� Always completely reassemble the mo-tor before operation.

Maintenance, replacement, or repair of theemission control devices and systems onmodels affixed with an emission controllabel may be performed by any marine en-gine repair establishment or individual. Allwarranty repairs, however, includingthose to the emission control system,must be performed by an authorizedYamaha marine dealership.

EMU28511

Replacement partsIf replacement parts are necessary, use onlygenuine Yamaha parts or parts of equivalentdesign and quality. Any part of inferior qualitymay malfunction, and the resulting loss ofcontrol could endanger the operator and pas-sengers. Yamaha genuine parts and acces-sories are available from your Yamahadealer.EMU34150

Severe operating conditionsSevere operating conditions involve one ormore of the following types of operation on aregular basis:� Operating continuously at or near maxi-

mum engine speed (rpm) for many hours� Operating continuously at a low engine

speed (rpm) for many hours� Brief periods of rapid acceleration and de-

celeration followed by engine shut off be-fore the engine has reached properoperating temperature

� Frequent quick acceleration and decelera-tion

� Frequent shifting� Frequently starting and stopping the en-

gine(s)� Operation that fluctuates often between

light and heavy cargo loadsOutboard motors operating under any ofthese above conditions require more frequentmaintenance. Yamaha recommends that youdo this service twice as often as specified inthe maintenance chart. For example, if a par-ticular service should be done at 50 hours, doit instead at 25 hours. This will help preventmore rapid deterioration of engine compo-nents.


Maintenance

61

EMU34445

Maintenance chart 1TIP:� Refer to the sections in this chapter for explanations of each owner-specific action.� The maintenance cycle on these charts assume usage of 100 hours per year and regular

flushing of the cooling water passages. Maintenance frequency should be adjusted when op-erating the engine under adverse conditions such as extended trolling.

� Disassembly or repairs may be necessary depending on the outcome of maintenancechecks.

� Expendable or consumable parts and lubricants will lose their effectiveness over time andthrough normal usage regardless of the warranty period.

� When operating in salt water, muddy, other turbid (cloudy), acidic water, the engine shouldbe flushed with clean water after each use.

The “ ” symbol indicates the check-ups which you may carry out yourself.The “ ” symbol indicates work to be carried out by your Yamaha dealer.

Item Actions

Initial Every

20 hours (3 months)

100 hours (1 year)

300 hours (3 years)

500 hours (5 years)

Anode(s) (external) Inspection or replace-ment as necessary

Anode(s) (cylinder head, thermostat cov-er)

Inspection or replace-ment as necessary

Anodes (exhaust cover, cooling water passage cover, Rectifier Regula-tor cover)

Replacement

Battery (electrolyte lev-el, terminal) Inspection

Battery (electrolyte lev-el, terminal)

Fill, charging or replac-ing as necessary

Cooling water leakage Inspection or replace-ment as necessary

Cowling clamp Inspection

Engine starting condi-tion/Noise Inspection

Engine idling speed/Noise Inspection

Engine oil Replacement

Engine Oil filter (car-tridge) Replacement

Fuel filter (can be dis-assembled)



Maintenance

62

Fuel line(High pres-sure) Inspection

Fuel line(High pres-sure)


Fuel line(Low pres-sure) Inspection

Fuel line(Low pres-sure)


Fuel pump Inspection or replace-ment as necessary

Fuel/oil leakage Inspection

Gear oil Replacement

Greasing points Greasing

Impeller/water pump housing


Impeller/water pump housing Replacement

Power trim & tilt unit Inspection

Propeller/Propeller nut/Cotter pin


PCV (Pressure Con-trol Valve)


Shift link/shift cableInspection, adjustment or replacement as nec-essary

Spark plug(s) Inspection or replace-ment as necessary

Spark plug caps/high tension cords


Water from the cooling water pilot hole Inspection

Throttle link/Throttle cable/Throttle pick-up timing

Inspection, adjustment or replacement as nec-essary

Thermostat Inspection or replace-ment as necessary

Timing belt Inspection or replace-ment as necessary

Valve clearance Inspection and adjust-ment

Water inlet Inspection

Item Actions

Initial Every

20 hours (3 months)

100 hours (1 year)

300 hours (3 years)

500 hours (5 years)


Maintenance

63

EMU34451

Maintenance chart 2

EMU28910

TIP:When using lead or high-sulfur gasoline, inspecting valve clearance may be required more fre-quently than every 500 hours.

Main switch/stop switch/choke switch


Wire harness connec-tions/Wire coupler con-nections


(Yamaha) Meter/gauge Inspection

(Yamaha) Fuel tank Inspection and clean-ing as necessary

Item ActionsEvery

1000 hours

Guide exhaust/ex-haust manifold


Timing belt Replacement

Item Actions

Initial Every

20 hours (3 months)

100 hours (1 year)

300 hours (3 years)

500 hours (5 years)


Maintenance

64

EMU28941

GreasingYamaha grease A (water resistant grease)Yamaha grease D (corrosion resistant grease; for propeller shaft)F75B, F80B, F90B, F100D

ZMU04266


Maintenance

65

EMU28955

Cleaning and adjusting spark plugThe spark plug is an important engine compo-nent and is easy to inspect. The condition ofthe spark plug can indicate something aboutthe condition of the engine. For example, if thecenter electrode porcelain is very white, thiscould indicate an intake air leak or carburetionproblem in that cylinder. Do not attempt to di-agnose any problems yourself. Instead, takethe outboard motor to a Yamaha dealer. Youshould periodically remove and inspect thespark plug because heat and deposits willcause the spark plug to slowly break downand erode. If electrode erosion becomes ex-cessive, or if carbon and other deposits areexcessive, you should replace the spark plugwith another of the correct type.1. Remove the spark plug caps from the

spark plugs.2. Remove the spark plug. If electrode ero-

sion becomes excessive, or if carbon andother deposits are excessive, you shouldreplace the spark plug with another of thecorrect type. WARNING! When remov-ing or installing a spark plug, be care-ful not to damage the insulator. Adamaged insulator could allow exter-nal sparks, which could lead to explo-sion or fire. [EWM00561]

3. Be sure to use the specified spark plug,otherwise the engine may not operateproperly. Before fitting the spark plug,measure the electrode gap with a wirethickness gauge; adjust the gap to speci-fication if necessary.

4. When fitting the plug, wipe off any dirtfrom the threads, and then screw it in tothe correct torque.

TIP:If a torque-wrench is not available when youare fitting a spark plug, a good estimate of thecorrect torque is 1/4 to 1/2 a turn past finger-tight. Have the spark plug adjusted to the cor-rect torque as soon as possible with a torque-wrench.EMU37492

Changing engine oil

NOTICEECM01710

Change the engine oil after the first 20hours of operation or 3 months, and every100 hours or at 1-year intervals thereafter.Otherwise the engine will wear quickly.

The engine oil should be extracted with an oilchanger.

Standard spark plug:LFR5A-11

1. Spark plug gap2. Spark plug part number3. Spark plug I.D. mark (NGK)

Spark plug gap:1.0–1.1 mm (0.039–0.043 in)

Spark plug torque:25.0 Nm (2.55 kgf-m, 18.4 ft-lb)


Maintenance

66

1. Put the outboard motor in an upright po-sition (not tilted). NOTICE: If the motoris not level, the oil level indicated onthe dipstick may not be accurate.[ECM01860]

2. Start the engine. Warm it up and keep theidle speed for 5-10 minutes.

3. Stop the engine and leave it for 5-10 min-utes.

4. Remove the top cowling.5. Remove the oil filler cap. Pull out the dip-

stick and use the oil changer to extractthe oil completely.

6. Add the correct amount of oil through thefiller hole. Put back the filler cap and thedipstick. NOTICE: Overfilling the oilcould cause leakage or damage. If theoil level is above the upper level mark,drain until the level meets the speci-fied capacity. [ECM01850]

7. Leave the outboard motor for 5-10 min-utes.

8. Remove oil dipstick and wipe it clean.9. Insert the dipstick and remove it again.

Be sure to completely insert the dipstickinto the dipstick guide, otherwise the oillevel measurement will be incorrect.

10. Recheck the oil level using the dipstick tobe sure the level falls between the upperand lower marks. Consult your Yamahadealer if the oil level is out of specified lev-el.

1. Oil changer

ZMU04270

ZMU061951

1. Oil filler cap

Recommended engine oil:4-stroke outboard motor oil

Total engine oil quantity (oil pan capaci-ty):



Replacement engine oil quantity (at peri-odic maintenance):



1

ZMU04271


Maintenance

67

11. Start the engine and make sure that thelow oil pressure-alert indicator remainsoff. Also, make sure that there are no oilleaks. NOTICE: If the low oil pressure-alert indicator comes on or if there areoil leaks, stop the engine and find thecause. Continued operation with aproblem could cause severe enginedamage. Consult your Yamaha dealerif the problem cannot be located andcorrected. [ECM01622]

12. Dispose of used oil according to localregulations.

TIP:� For more information on the disposal of

used oil, consult your Yamaha dealer.� Change the oil more often when operating

the engine under adverse conditions suchas extended trolling.

EMU29112

Checking wiring and connectors� Check that each grounding wire is properly

secured.� Check that each connector is engaged se-

curely.

EMU32111

Checking propeller

WARNINGEWM01880

You could be seriously injured if the en-gine accidentally starts when you are nearthe propeller.� Before inspecting, removing, or install-

ing the propeller, place the shift controlin neutral, turn the main switch to “ ”(off) and remove the key, and removethe clip from the engine shut-off switch.Turn off the battery cut-off switch if yourboat has one.

Do not use your hand to hold the propellerwhen loosening or tightening the propellernut. Put a wood block between the anti-cavi-tation plate and the propeller to prevent thepropeller from turning.

Checkpoints

1. Lower level mark2. Oil dipstick3. Upper level mark

ZMU04243

ZMU01897


Maintenance

68

� Check each of the propeller blades forwear, erosion from cavitation or ventilation,or other damage.

� Check the propeller shaft for damage.� Check the splines for wear or damage.� Check for fish line tangled around the pro-

peller shaft.

� Check the propeller shaft oil seal for dam-age.

EMU30662

Removing propellerEMU29197

Spline models1. Straighten the cotter pin and pull it out us-

ing a pair of pliers.2. Remove the propeller nut, washer, and

spacer (if equipped). WARNING! Do notuse your hand to hold the propellerwhen loosening the propeller nut.[EWM01890]

3. Remove the propeller, washer (ifequipped), and thrust washer.

EMU30672

Installing propellerEMU29233

Spline models

NOTICEECM00500

Be sure to use a new cotter pin and bendthe ends over securely. Otherwise the pro-peller could come off during operation andbe lost.

1. Apply Yamaha marine grease or a corro-sion resistant grease to the propellershaft.

2. Install the spacer (if equipped), thrustwasher, washer (if equipped), and pro-peller on the propeller shaft. NOTICE: Besure to install the thrust washer beforeinstalling the propeller, otherwise thelower case and propeller boss couldbe damaged. [ECM01880]

3. Install the spacer (if equipped) and thewasher. Tighten the propeller nut to thespecified torque.

4. Align the propeller nut with the propellershaft hole. Insert a new cotter pin in thehole and bend the cotter pin ends.NOTICE: Do not reuse the cotter pininstalled. Otherwise the propeller cancome off during operation. [ECM01890]

1. Cotter pin2. Propeller nut3. Washer

ZMU03228

1

2

3

4

5

6

4. Spacer5. Propeller6. Thrust washer

Propeller nut tightening torque:35.0 Nm (3.57 kgf-m, 25.8 ft-lb)


Maintenance

69

TIP:If the propeller nut does not align with the pro-peller shaft hole after tightening to the speci-fied torque, tighten the nut further to align itwith the hole.EMU29287

Changing gear oil

WARNINGEWM00800

� Be sure the outboard motor is securelyfastened to the transom or a stablestand. You could be severely injured ifthe outboard motor falls on you.

� Never get under the lower unit while it istilted, even when the tilt support lever orknob is locked. Severe injury could oc-cur if the outboard motor accidentallyfalls.

1. Tilt the outboard motor so that the gear oildrain screw is at the lowest point possi-ble.

2. Place a suitable container under the gearcase.

3. Remove the gear oil drain screw and gas-ket. NOTICE: If there is an excessivequantity of metal particles on the mag-netic gear oil drain screw, this can in-dicate lower unit problem. Consultyour Yamaha dealer. [ECM01900]

TIP:� If a magnetic gear oil drain screw is

equipped, remove all metal particles fromthe screw before installing it.

� Always use new gaskets. Do not reuse theremoved gaskets.

4. Remove the oil level plug and gasket toallow the oil to drain completely.NOTICE: Inspect the used oil after ithas been drained. If the oil is milky,water is getting into the gear casewhich can cause gear damage. Con-sult a Yamaha dealer for repair of thelower unit seals. [ECM00711]

TIP:For disposal of used oil, consult your Yamahadealer.5. Put the outboard motor in a vertical posi-

tion. Using a flexible or pressurized fillingdevice, inject the gear oil into the gear oildrain screw hole.

ZMU02063

1. Gear oil drain screw2. Oil level plug

Recommended gear oil:Hypoid gear oil SAE#90

Gear oil quantity:0.670 L (0.708 US qt, 0.590 Imp.qt)

ZMU03273

2

1


Maintenance

70

6. Put a new gasket on the oil level plug.When the oil begins to flow out of the oillevel plug hole, insert and tighten the oillevel plug.

7. Put a new gasket on the gear oil drainscrew. Insert and tighten the gear oildrain screw.

EMU29302

Cleaning fuel tank

WARNINGEWM00920

Gasoline is highly flammable, and its va-pors are flammable and explosive.� If you have any question about properly

doing this procedure, consult yourYamaha dealer.

� Keep away from sparks, cigarettes,flames, or other sources of ignitionwhen cleaning the fuel tank.

� Remove the fuel tank from the boat be-fore cleaning it. Work only outdoors inan area with good ventilation.

� Wipe up any spilled fuel immediately.

� Reassemble the fuel tank carefully. Im-proper assembly can result in a fuelleak, which could result in a fire or ex-plosion hazard.

� Dispose of old gasoline according to lo-cal regulations.

1. Empty the fuel tank into an approved con-tainer.

2. Pour a small amount of suitable solventinto the tank. Install the cap and shakethe tank. Drain the solvent completely.

3. Remove the screws holding the fuel jointassembly. Pull the assembly out of thetank.

Tightening torque:9.0 Nm (0.92 kgf-m, 6.6 ft-lb)

Tightening torque:9.0 Nm (0.92 kgf-m, 6.6 ft-lb)

ZMU03274

ZMU03231


Maintenance

71

4. Clean the filter (located on the end of thesuction pipe) in a suitable cleaning sol-vent. Allow the filter to dry.

5. Replace the gasket with a new one. Re-install the fuel joint assembly and tightenthe screws firmly.

EMU29312

Inspecting and replacing anode(s)Yamaha outboard motors are protected fromcorrosion by sacrificial anodes. Inspect theexternal anodes periodically. Remove scalesfrom the surfaces of the anodes. Consult aYamaha dealer for replacement of externalanodes.

NOTICEECM00720

Do not paint anodes, as this would renderthem ineffective.

TIP:Inspect ground leads attached to external an-odes on equipped models. Consult a Yamahadealer for inspection and replacement of inter-nal anodes attached to the power unit.

EMU29322

Checking battery (for electric start models)

WARNINGEWM01900

Battery electrolytic fluid is poisonous andcaustic, and batteries generate explosivehydrogen gas. When working near the bat-tery:� Wear protective eye gear and rubber

gloves.� Do not smoke or bring any other source

of ignition near the battery.Refer to page 11 for detailed safety infor-mation about batteries.

The procedure for checking the battery variesfor different batteries. This procedure con-tains typical checks that apply to many batter-ies, but you should always refer to the batterymanufacturer’s instructions.

ZMU02324

ZMU04245


Maintenance

72

NOTICEECM01920

A poorly maintained battery will quicklydeteriorate.

1. Check the electrolyte level.

2. Check the battery’s charge. If your boat isequipped with the digital speedometer,the voltmeter and low battery alert func-tions will help you monitor the battery’scharge. If the battery needs charging,consult your Yamaha dealer.

3. Check the battery connections. Theyshould be clean, secure, and covered byan insulating cover. WARNING! Badconnections can produce shorting orarcing and cause an explosion. [EWM01910]

EMU29333

Connecting the battery

WARNINGEWM00570

Mount the battery holder securely in a dry,well-ventilated, vibration-free location inthe boat. Install a fully charged battery inthe holder.

NOTICEECM01123

Reversal of the battery cables will damagethe electrical parts.

1. Make sure the main switch (on applicablemodels) is “ ” (off) before working onthe battery.

2. Connect the red battery cable to thePOSITIVE (+) terminal first. Then con-nect the black battery cable to the NEGA-TIVE (-) terminal.

3. The electrical contacts of the battery andcables must be clean and properly con-nected, or the battery will not start the en-gine.

EMU29371

Disconnecting the battery1. Turn off the battery cut-off switch (if

equipped) and main switch. NOTICE: Ifthey are left on, the electrical systemcan be damaged. [ECM01930]

2. Disconnect the negative cable(s) fromthe negative (-) terminal. NOTICE: Al-ways disconnect all negative (-) ca-bles first to avoid a short circuit anddamage to the electrical system.[ECM01940]

3. Disconnect the positive cable(s) and re-move the battery from the boat.

4. Clean, maintain, and store the battery ac-cording to the manufacturer’s instruc-tions.

1. Red cable2. Black cable3. Battery


Trouble Recovery

73

EMU29427

TroubleshootingA problem in the fuel, compression, or ignitionsystems can cause poor starting, loss of pow-er, or other problems. This section describesbasic checks and possible remedies, and cov-ers all Yamaha outboard motors. Thereforesome items may not apply to your model.If your outboard motor requires repair, bring itto your Yamaha dealer.If the engine trouble-alert indicator is flashing,consult your Yamaha dealer.

Starter will not operate.Q. Is battery capacity weak or low?A. Check battery condition. Use battery of rec-ommended capacity.

Q. Are battery connections loose or corrod-ed?A. Tighten battery cables and clean batteryterminals.

Q. Is fuse for electric start relay or electric cir-cuit blown?A. Check for cause of electric overload andrepair. Replace fuse with one of correct am-perage.

Q. Are starter components faulty?A. Have serviced by a Yamaha dealer.

Q. Is shift lever in gear?A. Shift to neutral.

Engine will not start (starter operates).Q. Is fuel tank empty?A. Fill tank with clean, fresh fuel.

Q. Is fuel contaminated or stale?A. Fill tank with clean, fresh fuel.

Q. Is fuel filter clogged?A. Clean or replace filter.

Q. Is starting procedure incorrect?A. See page 43.

Q. Has fuel pump malfunctioned?A. Have serviced by a Yamaha dealer.

Q. Are spark plug(s) fouled or of incorrecttype?A. Inspect spark plug(s). Clean or replace withrecommended type.

Q. Are spark plug cap(s) fitted incorrectly?A. Check and re-fit cap(s).

Q. Is ignition wiring damaged or poorly con-nected?A. Check wires for wear or breaks. Tighten allloose connections. Replace worn or brokenwires.

Q. Are ignition parts faulty?A. Have serviced by a Yamaha dealer.

Q. Is engine shut-off cord (lanyard) not at-tached?A. Attach cord.

Q. Are engine inner parts damaged?A. Have serviced by a Yamaha dealer.

Engine idles irregularly or stalls.Q. Are spark plug(s) fouled or of incorrecttype?A. Inspect spark plug(s). Clean or replace withrecommended type.

Q. Is fuel system obstructed?


Trouble Recovery

74

A. Check for pinched or kinked fuel line or oth-er obstructions in fuel system.



Q. Have ignition parts failed?A. Have serviced by a Yamaha dealer.

Q. Has alert system activated?A. Find and correct cause of alert.

Q. Is spark plug gap incorrect?A. Inspect and adjust as specified.


Q. Is specified engine oil not being used?A. Check and replace oil as specified.

Q. Is thermostat faulty or clogged?A. Have serviced by a Yamaha dealer.

Q. Are carburetor adjustments incorrect?A. Have serviced by a Yamaha dealer.

Q. Is fuel pump damaged?A. Have serviced by a Yamaha dealer.

Q. Is air vent screw on fuel tank closed?A. Open air vent screw.

Q. Is choke knob pulled out?

A. Return to home position.

Q. Is motor angle too high?A. Return to normal operating position.

Q. Is carburetor clogged?A. Have serviced by a Yamaha dealer.

Q. Is fuel joint connection incorrect?A. Connect correctly.

Q. Is throttle valve adjustment incorrect?A. Have serviced by a Yamaha dealer.

Q. Is battery cable disconnected?A. Connect securely.

Alert buzzer sounds or indicator lights.Q. Is cooling system clogged?A. Check water intake for restriction.

Q. Is engine oil level low?A. Fill oil tank with specified engine oil.

Q. Is heat range of spark plug incorrect?A. Inspect spark plug and replace it with rec-ommended type.

Q. Is specified engine oil not being used?A. Check and replace oil with specified type.

Q. Is engine oil contaminated or deteriorated?A. Replace oil with fresh, specified type.

Q. Is oil filter clogged?A. Have serviced by a Yamaha dealer.

Q. Has oil feed/injection pump malfunc-tioned?A. Have serviced by a Yamaha dealer.


Trouble Recovery

75

Q. Is load on boat improperly distributed?A. Distribute load to place boat on an evenplane.

Q. Is water pump or thermostat faulty?A. Have serviced by a Yamaha dealer.

Q. Is there excess water in fuel filter cup?A. Drain filter cup.

Engine power loss.Q. Is propeller damaged?A. Have propeller repaired or replaced.

Q. Is propeller pitch or diameter incorrect?A. Install correct propeller to operate outboardat its recommended speed (r/min) range.

Q. Is trim angle incorrect?A. Adjust trim angle to achieve most efficientoperation.

Q. Is motor mounted at incorrect height ontransom?A. Have motor adjusted to proper transomheight.

Q. Has alert system activated?A. Find and correct cause of alert.

Q. Is boat bottom fouled with marine growth?A. Clean boat bottom.

Q. Are spark plug(s) fouled or of incorrecttype?A. Inspect spark plug(s). Clean or replace withrecommended type.

Q. Are weeds or other foreign matter tangledon gear housing?

A. Remove foreign matter and clean lowerunit.

Q. Is fuel system obstructed?A. Check for pinched or kinked fuel line or oth-er obstructions in fuel system.



Q. Is spark plug gap incorrect?A. Inspect and adjust as specified.


Q. Have electrical parts failed?A. Have serviced by a Yamaha dealer.

Q. Is specified fuel not being used?A. Replace fuel with specified type.

Q. Is specified engine oil not being used?A. Check and replace oil with specified type.

Q. Is thermostat faulty or clogged?A. Have serviced by a Yamaha dealer.

Q. Is air vent screw closed?A. Open the air vent screw.

Q. Is fuel pump damaged?A. Have serviced by a Yamaha dealer.

Q. Is fuel joint connection incorrect?


Trouble Recovery

76

A. Connect correctly.

Q. Is heat range of spark plug incorrect?A. Inspect spark plug and replace it with rec-ommended type.

Q. Is high pressure fuel pump drive belt bro-ken?A. Have serviced by a Yamaha dealer.

Q. Is engine not responding properly to shiftlever position?A. Have serviced by a Yamaha dealer.

Engine vibrates excessively.Q. Is propeller damaged?A. Have propeller repaired or replaced.

Q. Is propeller shaft damaged?A. Have serviced by a Yamaha dealer.

Q. Are weeds or other foreign matter tangledon propeller?A. Remove and clean propeller.

Q. Is motor mounting bolt loose?A. Tighten bolt.

Q. Is steering pivot loose or damaged?A. Tighten or have serviced by a Yamahadealer.EMU29433

Temporary action in emergencyEMU29440

Impact damage

WARNINGEWM00870

The outboard motor can be seriously dam-aged by a collision while operating ortrailering. Damage could make the out-board motor unsafe to operate.

If the outboard motor hits an object in the wa-ter, follow the procedure below.

1. Stop the engine immediately.2. Inspect the control system and all compo-

nents for damage. Also inspect the boatfor damage.

3. Whether damage is found or not, returnto the nearest harbor slowly and careful-ly.

4. Have a Yamaha dealer inspect the out-board motor before operating it again.

EMU29473

Replacing fuseIf a fuse has blown, remove the electrical cov-er, open the fuse holder and remove the fusewith a fuse puller (if equipped). Replace it witha spare one of the proper amperage.

WARNINGEWM00631

Substituting an incorrect fuse or a piece ofwire could allow excessive current flow.This could cause electric system damageand a fire hazard.

Consult your Yamaha dealer if the new fuseimmediately blows again.


Trouble Recovery

77

EMU29524

Power trim and tilt will not operateIf the engine cannot be tilted up or down withthe power trim and tilt because of a dis-charged battery or a failure with the powertrim and tilt unit, the engine can be tilted man-ually.1. Loosen the manual valve screw by turn-

ing it counterclockwise until it stops.

2. Put the engine in the desired position,then tighten the manual valve screw byturning it clockwise.

EMU37580

Water separator-alert indicator blinks while cruising

WARNINGEWM01500

Gasoline is highly flammable, and its va-pors are flammable and explosive.� Do not perform this procedure on a hot

or running engine. Allow the engine tocool.

� There will be fuel in the fuel filter. Keepaway from sparks, cigarettes, flames orother sources of ignition.

� This procedure will allow some fuel tospill. Catch fuel in a rag. Wipe up anyspilled fuel immediately.

� The fuel filter must be reassembledcarefully with the O-ring, filter cup, andhoses in place. Improper assembly orreplacement could result in a fuel leak,which could result in a fire or explosionhazard.

If the water separator-alert indicator on the6Y8 Multifunction tachometer blinks, performthe following procedure.

1. Electrical cover2. Fuse puller3. Fuse holder4. Starter relay fuse (30 A)5. Rectifier Regulator (Main) fuse (20 A)6. Main switch / trim switch fuse (20 A)7. Engine control unit / ignition coil / electric

fuel pump / fuel injector / ISC (idle speed control) fuse (20 A)

8. Spare fuse (20 A, 30 A)

1. Manual valve screw

ZMU042491


Trouble Recovery

78

1. Stop the engine.2. Remove the top cowling.3. Remove the plastic tie.

4. Disconnect the water detection switchcoupler. NOTICE: Be careful not to getany water on the water detectionswitch coupler, otherwise a malfunc-tion could occur. [ECM01950]

5. Unscrew the filter cup from the filter hous-ing. NOTICE: Be careful not to twist thewater detection switch lead when un-screwing the filter cup. [ECM01960]

6. Drain the water in the filter cup by soakingit up with a rag.

1. Water separator-alert indicator

1. Plastic tie

1. Water detection switch coupler

1. Filter cup2. Water detection switch lead


Trouble Recovery

79

7. Firmly screw the filter cup onto the filterhousing. NOTICE: Be careful not totwist the water detection switch leadwhen screwing the filter cup onto thefilter housing. [ECM01970]

8. Connect the water detection switch cou-pler securely until a click is heard.

9. Fasten the water detection switch leadwith the plastic tie.

10. Install the top cowling.11. Start the engine and make sure that the

water separator-alert indicator remainsoff. Have a Yamaha dealer inspect theoutboard motor after returning to port.

EMU29542

Starter will not operateIf the starter mechanism does not operate(the engine cannot be cranked with the start-er), the engine can be started manually withan emergency starter rope. However, the en-gine cannot be started manually if the batteryvoltage is low. If the battery is discharged to 9volts or below, the electric fuel pump will notoperate.

WARNINGEWM01022

� Use this procedure only in an emergen-cy to return to the nearest port for re-pairs.

� When the emergency starter rope isused to start the engine, the start-in-gear protection device does not operate.Make sure the remote control lever is inneutral. Otherwise the boat could unex-pectedly start to move, which could re-sult in an accident.

� Attach the engine shut-off cord to a se-cure place on your clothing, or your armor leg while operating the boat.

� Do not attach the cord to clothing thatcould tear loose. Do not route the cordwhere it could become entangled, pre-venting it from functioning.


� Make sure no one is standing behindyou when pulling the starter rope. Itcould whip behind you and injure some-one.

1. Water detection switch coupler

1. Plastic tie


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� An unguarded, rotating flywheel is verydangerous. Keep loose clothing andother objects away when starting the en-gine. Use the emergency starter ropeonly as instructed. Do not touch the fly-wheel or other moving parts when theengine is running. Do not install thestarter mechanism or top cowling afterthe engine is running.

� Do not touch the ignition coil, spark plugwire, spark plug cap, or other electricalcomponents when starting or operatingthe motor. You could get an electricalshock.

EMU30651

Emergency starting engine1. Remove the top cowling.2. Lift up the rear of flywheel cover and pull

it forward to remove it.

3. Prepare the engine for starting. For fur-ther information, see page 43. Be surethe engine is in neutral and that the clip isattached to the engine shut-off switch.The main switch must be “ ” (on).

4. Insert the knotted end of the emergencystarter rope into the notch in the flywheelrotor and wind the rope around the fly-wheel clockwise.

5. Pull the rope slowly until resistance is felt.6. Remove the rope from the flywheel tem-

porarily.7. Rewind the rope around the flywheel ap-

proximately 3/4 of a turn clockwise.8. Give a strong pull straight out to crank

and start the engine. Repeat if neces-sary.

ZMU02334


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81

EMU33501

Treatment of submerged motorIf the outboard motor is submerged, immedi-ately take it to a Yamaha dealer. Otherwisesome corrosion may begin almost immediate-ly. NOTICE: Do not attempt to run the out-board motor until it has been completelyinspected. [ECM00401]

ZMU04272


YAMAHA MOTOR CO., LTD.

Printed on recycled paperPrinted in JapanNovember 2008–0.1 × 1 CR


6D6-28199-26

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