Yamha Tw 125 Manuel

57

Transcript of Yamha Tw 125 Manuel

Page 1: Yamha Tw 125 Manuel
Page 2: Yamha Tw 125 Manuel

FOREWORD

This Supplementary Service Manual has been prepared to introduce new service and data for theTW125 2002. For complete service information procedures it is necessary to use this SupplementaryService Manual together with the following manual.

TW125 SERVICE MANUAL: 5EK1-AE1

TW125 2002SUPPLEMENTARYSERVICE MANUAL

2001 by Yamaha Motor Co., Ltd.First Edition, August 2001

Any reproduction or unauthorized usewithout the written permission of

Yamaha Motor Co., Ltd. is expresslyprohibited.

Page 3: Yamha Tw 125 Manuel

NOTE:

WARNING

CAUTION:

EB001000

NOTICEThis manual was produced by the Yamaha Motor Company primarily for use by Yamaha dealers andtheir qualified mechanics. It is not possible to include all the knowledge of a mechanic in one manual,so it is assumed that anyone who uses this book to perform maintenance and repairs on Yamahamotorcycle has a basic understanding of the mechanical ideas and the procedures of motorcyclerepair. Repairs attempted by anyone without this knowledge are likely to render the motorcycle unsafeand unfit for use.

Yamaha Motor Company, Ltd. is continually striving to improve all its models. Modifications andsignificant changes in specifications or procedures will be forwarded to all authorized Yamaha dealersand will appear in future editions of this manual where applicable.

Designs and specifications are subject to change without notice.

EAS00004

IMPORTANT INFORMATIONParticularly important information is distinguished in this manual by the following notations.

The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOURSAFETY IS INVOLVED!

Failure to follow WARNING instructions could result in severe injury or death tothe motorcycle operator, a bystander or a person inspecting or repairing themotorcycle.

A CAUTION indicates special precautions that must be taken to avoid damageto the motorcycle.

NOTE: A NOTE provides key information to make procedures easier or clearer.

Page 4: Yamha Tw 125 Manuel

12

5

7

6

4 3

8

EAS00007

HOW TO USE THIS MANUALThis manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensiveexplanations of all installation, removal, disassembly, assembly, repair and inspection procedures arelaid out with the individual steps in sequential order.

1 The manual is divided into chapters. An abbreviation and symbol in the upper right corner of eachpage indicate the current chapter. Refer to “SYMBOLS” on the following page.

2 Each chapter is divided into sections. The current section title is shown at the top of each page,except in Chapter 3 (“Periodic Inspections and Adjustments”), where the sub-section title(-s) appear.

(In Chapter 3, “Periodic Inspections and Adjustments”, the sub-section title appears at the top of eachpage, instead of the section title.)

3 Sub-section titles appear in smaller print than the section title.

4 To help identify parts and clarify procedure steps, there are exploded diagrams at the start of eachremoval and disassembly section.

5 Numbers are given in the order of the jobs in the exploded diagram. A circled number indicates adisassembly step.

6 Symbols indicate parts to be lubricated or replaced (see “SYMBOLS”).

7 A job instruction chart accompanies the exploded diagram, providing the order of jobs, names ofparts, notes in jobs, etc.

8 Jobs requiring more information (such as special tools and technical data) are described sequen-tially.

Page 5: Yamha Tw 125 Manuel

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5

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9

2

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23 24

2220

18 1917

15

1413

11 12

10

GENINFO SPEC

ENG

CARB

ELEC

CHAS

CHKADJ

TRBLSHTG

16

EAS00009

SYMBOLSThe following symbols are not relevant to everyvehicle.Symbols 1 to 9 indicate the subject of eachchapter.1 General information2 Specifications3 Periodic checks and adjustments4 Engine5 Carburetor(-s)6 Chassis7 Electrical system8 Troubleshooting

Symbols 9 to 16 indicate the following.9 Serviceable with engine mounted10 Filling fluid11 Lubricant12 Special tool13 Tightening torque14 Wear limit, clearance15 Engine speed16 Electrical data

Symbols 17 to 22 in the exploded diagrams indi-cate the types of lubricants and lubricationpoints.17 Engine oil18 Gear oil19 Molybdenum disulfide oil20 Wheel bearing grease21 Lithium soap base grease22 Molybdenum disulfide grease

Symbols 23 to 24 in the exploded diagrams indi-cate the following:23 Apply locking agent (LOCTITE)24 Replace the part

Page 6: Yamha Tw 125 Manuel

CONTENTS

SPECIFICATIONSGENERAL SPECIFICATIONS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAINTENANCE SPECIFICATIONS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENGINE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHASSIS 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CABLE ROUTING 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PERIODIC CHECKS AND ADJUSTMENTSINTRODUCTION 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PERIODIC MAINTENANCE/LUBRICATION INTERVALS 16. . . . . . . . .

ENGINE 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ADJUSTING THE ENGINE IDLING SPEED 18. . . . . . . . . . . . . . . . . . . . .

ADJUSTING THE THROTTLE CABLE FREE PLAY 19. . . . . . . . . . . .

ELECTRICAL SYSTEM 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHECKING AND CHARGING THE BATTERY 21. . . . . . . . . . . . . . . . . .

REPLACING THE HEADLIGHT BULB 27. . . . . . . . . . . . . . . . . . . . . . . . . . .

ADJUSTING THE HEADLIGHT BEAM 28. . . . . . . . . . . . . . . . . . . . . . . . . . .

ENGINECLUTCH 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CARBURETORCARBURETOR 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHECKING THE CARBURETOR 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ASSEMBLING THE CARBURETOR 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLING THE CARBURETOR 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MEASURING AND ADJUSTING THE FUEL LEVEL 37. . . . . . . . . . . .

CHASSISFRONT WHEEL AHD BRAKE DISC 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR WHEEL AND REAR BRAKE 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR WHEEL 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR BRAKE AND REAR WHEEL SPROCKET 42. . . . . . . . . . . . . . . .

FRONT FORK 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

HANDLEBAR 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STEERING HEAD 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LOWER BRACKET 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL SYSTEMIGNITION SYSTEM 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CIRCUIT DIAGRAM 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHECKING THE IGNITION SYSTEM 50. . . . . . . . . . . . . . . . . . . . . . . . . . . .

TW125 2002 WIRING DIAGRAM

Page 7: Yamha Tw 125 Manuel

GENERAL SPECIFICATIONS SPEC

SPECIFICATIONS

GENERAL SPECIFICATIONS

Model TW125

Model code: 5RS1, 5RS2

Dimensions:Overall lengthOverall widthOverall heightSeat heightWheelbaseMinimum ground clearanceMinimum turning radius

2,135 mm,820 mm

1,120 mm,820 mm

1,350 mm,255 mm

2,100 mm

Carburetor:Type/quantityManufacturer

MV28/1TEIKEI

Transmission:Primary reduction systemPrimary reduction ratioSecondary reduction systemSecondary reduction ratioTransmission typeOperationGear ratio 1st

2nd3rd4th5th

Spur gear74/20 (3.700)Chain drive51/14 (3.643)Constant mesh 5 speedLeft foot operation36/16 (2.250)31/21 (1.476)27/24 (1.125)25/27 (0.926)23/29 (0.793)

Chassis:Frame typeCaster angleTrail

Diamond2550’93 mm

Tire:TypeSize front

rearManufacture front

rearType front

rear

Tube type130/80-18 66P130/80-18 M/C 66P180/80-14 M/C 78PBRIDGESTONEBRIDGESTONETW203TW204

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Page 8: Yamha Tw 125 Manuel

GENERAL SPECIFICATIONS SPEC

Model TW125

Wheel travel:Front wheel travelRear wheel travel

150 mm150 mm

Electrical:Ignition systemGenerator systemBattery typeBattery capacity

C.D.I.A.C. magnetoGT6B-312 V 6 AH

Bulb wattage quantity:HeadlightAuxiliary lightTail /brake lightTurn signal lightMeter lightHigh beam indicator lightNeutral indicator lightTurn signal indicator light

12 V 60 W/55 W 112 V 4 W 112 V 5 W/21 W 112 V 21 W 412 V 3.4 W 112 V 3.4 W 112 V 3.4 W 112 V 3.4 W 1

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Page 9: Yamha Tw 125 Manuel

MAINTENANCE SPECIFICATIONS SPEC

MAINTENANCE SPECIFICATIONSENGINE

Item Standard Limit

Clutch:Friction plate thicknessQuantity

Clutch plate thicknessQuantity

Clutch spring free lengthQuantity

Push rod bending limit

2.9 3.1 mm5 pcs.1.6 mm4 pcs.34.9 mm4 pcs.

2.7 mm

0.05 mm

33.9 mm

0.2 mm

Carburetor:TypeI.D. markMain jet (M.J)Main air jet (M.A.J)Jet needle (J.N)Needle jet (N.J)Pilot air jet 1 (P.A.J.1)Pilot air jet 2 (P.A.J.2)Pilot outlet (P.O)Pilot jet (P.J)Bypass 1 (B.P.1)Bypass 2 (B.P.2)Bypass 3 (B.P.3)Bypass 4 (B.P.4)Pilot screw (P.S)Valve seat size (V.S)Starter jet 1 (G.S.1)Starter jet 2 (G.S.2)Fuel level (F.L)Engine idle speedIntake vacuum

MV285RS1 00#134ø1.25A50-3/5B1/60#90#1200.8#340.70.70.70.71-1/21.60.60.80 2.0 mm1,450 1,650 r/min190 230 mmHg

TIGHTENING TORQUESENGINE

Part to be tightened Part name Threadsize

Q’tyTightening

torque Remarksgsize

yNm mkg

Cam sprocket coverOil filter coverCrankcase (left and right)Generator coverClutch coverClutch bossDrive sprocketPick up coilStator coil

ScrewScrewScrewScrewScrew

NutBolt

ScrewScrew

M6M6M6M6M6

M14M5M6M6

22

1210101223

1010101010504

1010

1.01.01.01.01.05.00.41.01.0

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Page 10: Yamha Tw 125 Manuel

MAINTENANCE SPECIFICATIONS SPEC

CHASSIS

Item Standard Limit

Front suspension:Front fork travelFork spring free lengthFitting lengthSpring rate (K1)Stroke (K1)Oil capacityOil levelOil gradeInner tube vend limit

150 mm330 mm325 mm4.9 N/mm (0.49 kg/mm)0 150 mm0.259 L (259 cm3)122 mmFork oil 10 WT or equivalent

323 mm

0.2 mm

Rear suspension:Shock absorber strokeSpring free lengthFitting lengthSpring rate (K1)Stroke (K1)

48 mm190 mm185 mm127 N/mm (12.7 kg/mm)0 48 mm

171 mm

Drive chain:Type/manufacturerNo. of linksChain free playMaximum ten-link section

428HD/DAIDO12535 60 mm129.5 mm

Rear brake:TypeDrum inside diameterShoe thicknessShoe spring free length

Leading, trailing130 mm4 mmCam side 52 mmPin side 48 mm

131 mm2 mm

Brake lever:Brake lever free play (at lever end) 5 8 mm

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Page 11: Yamha Tw 125 Manuel

MAINTENANCE SPECIFICATIONS SPEC

NOTE:

TIGHTENING TORQUESCHASSIS

Part to be tightened Thread sizeTightening

torque RemarksgNm mkg

Headlight and headlight stayHandle crown and steering shaftSteering ring nutBrake hose union bolt (front brake)Swingarm pivot shaftFootrest (left)

(right)Rear footrestBrake caliper and front forkRear wheel sprocket and hub

M8M22M25M10M12M12M10M8

M10M8

161104

30838848164043

1.611.00.43.08.38.84.81.64.04.3

Refer to NOTE

1. When tighten the ring nut, should be steady the ball bearings and the steering shaft moving smooth-ly.

2. First, tighten the ring nut approximately 38 Nm (3.8 mkg) by using the torque wrench, then loosenthe ring nut one turn and retighten the ring nut to specification.

ELECTRICAL

Item Standard Limit

Charging system:TypeModel/manufacturerStandard outputStator coil resistance/color

C.D.I. magnetoF5BT/YAMAHA14 V 170 W/5,000 r/min0.48 0.72 Ω at 20C/White – White

Battery:Specific gravity 1.320

Electric starter system:TypeStarter motor:Model/manufacturerOutputArmature coil resistanceBrush overall lengthBrush spring pressureCommutator diameterMica undercut (depth)

Constant mesh type

5RS/YAMAHA0.4 kW0.0126 0.0154 Ω at 20C10 mm5.52 8.28 N (552 828 g)22 mm1.5 mm

3.5 mm

21 mm

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Page 12: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

12 Wire harness13 Front turn signal light lead (right)14 Indicator lead

1 Brake hose2 Throttle cables3 Front brake light switch lead4 Right handlebar switch lead5 Main switch lead6 Clutch cable7 Clutch switch lead8 Speedometer cable9 Left handlebar switch lead10 Front turn signal light lead (left)11 Meter lead

A Clamp the grommet of brakehose with the band. Aftercompletion of clamping, cut thesurplus part and point it to thebackward.

B No positioning for the headlightbody is specified.

C To the headlight

CABLE ROUTING

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Page 13: Yamha Tw 125 Manuel

A After clamping the wire harness,point the surplus part to thedownward. Clamp the part im-mediately before the junction tothe C.D.I. unit and relay.

B Cut it to be 10 mm or less.C Handlebar switch lead (right)

and front brake light switch leadshould not be twined around.

1 Battery positive lead2 Starter relay3 Starter motor lead4 Clamp5 Ignition coil6 Throttle cable (pull side)7 Throttle cable (return side)8 Throttle cable holder9 Horn lead10 Spark plug lead11 Relay (White)12 C.D.I. unit

CABLE ROUTING SPEC

13 Diode14 Resister lead15 Turn signal relay

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Page 14: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

I Pass the throttle cables throughthe engine bracket hole. Pointthe surplus part to the downwardand cut the end.

J Pass the carburetor heater leadin front of the seat pillar tube sothat it is not caught between theside cover flange and seat pillartube frame.

K Point the rear brake switch leadwire to the rear side of frame.

switch lead, main switch lead,resonator hose and startercable.

F Clamp the ignition coil lead andthe ignition coil grand lead hornlead.

G Route the wire harness, handle-bar switch lead (right) and frontbrake light switch lead throughthe guide.

H Do not bend the lead sharply justafter the terminal connection.

D Clamp the wire harness, handlebar switch lead (right), frontbrake light switch lead, clutchswitch lead and main switchlead. After clamping, point thesurplus part to the downwardand then cut it. Do not clamp theresonator hose and startercable.

E Clamp the wire harness, handle-bar switch lead (right), frontbrake light switch lead, clutch

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Page 15: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

O Clamp the wire harness anddiode. Point the surplus part tothe downward.

L Clamp the rear brake switch leadconnector and turn signal relaylead with the band and point thesurplus part to the inner side,then cut it. Secure the connectorat the front part of frame.

M Push the wire harness in be-tween frame and box.

N Place the C.D.I. unit on themounting port for the left siderelay.

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Page 16: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

A Clamp between the positioningbelts of resonator hose. Do notpinch the resonator hose.

B Starter cable, clutch switch leadand main switch lead should notbe twined around.

C Clamp at the point ahead of thepart where resonator hose pro-tector is torn. Do not pinch theresonator hose.

D Place the coupler below the res-onator hose.

1 Resonator hose2 Fuel hose3 Rectifier / regulator lead4 Thermo switch lead5 Sidestand switch lead6 Air filter case7 Breather hose8 Battery negative lead9 C.D.I. magneto leads10 Over flow hose11 Air vent hose12 Clutch cable

13 Clutch cable guide14 Brake hose15 Speedometer cable16 Handlebar switch lead (left)17 Clamp18 Flange bolt19 Brake hose holder

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Page 17: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

tween engine and swingarm.M Route the neutral switch lead be-

tween engine and swingarm.N Route the air vent hose and over

flow hose through the engineguide.

O To the fuel cock.P Route the horn lead through in-

side the clutch cable.Q Insert the starter cable to the

clamp.

side, then cut it.H Clamp the sidestand switch

lead.I Clamp the air vent hose, over

flow hose, starter motor lead andneutral switch lead.

J Hold down the side stand switchlead using the special washer.

K Route the air vent hose and overflow hose between engine andswingarm.

L Route the starter motor lead be-

E Clamp the rectifier / regulatorlead and resonator hose. Pointthe surplus part toward the innerside. Clamp within a rangewhere the resonator hose pro-tector is torn. Do not pinch theresonator hose.

F Place the air vent hose in the in-ner side of the main pipe.

G Clamp the C.D.I. magneto leadat the frame pipe bend and pointthe surplus part to the inner

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Page 18: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

V Place the speedometer cable inthe inner side.

W After tightening screws, insertthe hose in the screw section.

X Distortion should be within thisrange toward the traveling direc-tion of vehicle.

Y Place the brake hose in the outerside.

R Clamp the brake hose andspeedometer cable. Align theclamping position with the centerof white paint mark on the brakehose.

S Clamp the brake hose andspeedometer cable with a hold-er.

T Point the speedometer cablecap to the backward.

U Make sure to push in the boot ful-ly.

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Page 19: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

24 C.D.I. magneto leads, neutralswitch lead

1 Handlebar switch lead (right)2 Front brake light switch lead3 Brake hose4 Throttle cable (return side)5 Throttle cable (pull side)6 Starter motor lead7 Battery positive lead8 Wire harness9 Clamp (wire harness)10 Thermo switch lead11 Sidestand switch lead12 Negative lead

13 Battery negative lead14 Grommet15 Rectifier / regulator16 Clamp (rectifier / regulator lead)17 Handlebar switch lead (left)18 Clutch switch lead19 Clutch cable20 Master cylinder21 Starter cable22 Rear turn signal light lead23 Turn signal light stay

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Page 20: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

H Pass the rear turn signal lightlead (right) between the rearframe and license bracket,avoiding to be caught.

I Pass the rear turn signal lightlead (left) between the rearframe and license bracket,avoiding to be caught.

J Clamp the rear turn signal lightlead (left). After clamping, pointthe surplus part to the inner side.

D Clamp the wire harness and rearturn signal light lead (right). Pointthe surplus part to the inner side.

E Cover the naked part of rear turnsignal light lead (right) with thehose.

F Cover the naked part of rear turnsignal light lead (left) with thehose.

G Clamp the wire harness and rearturn signal lead (right).

A Clamp the handlebar switch leadand front brake light switch leadwith a band.

B Clamp the throttle cables.C Clamp the C.D.I. magneto lead

(2 leads), starter motor lead,neutral switch lead, battery neg-ative lead and pass themthrough the frame gusset hole,then point the surplus part to theinner side.

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Page 21: Yamha Tw 125 Manuel

CABLE ROUTING SPEC

O Clamp the handlebar switch lead(left) and clutch switch lead.

P After clamping, cut where it is notvisible either from the top or therear.

K Clamp the thermo switch leadcoupler. After clamping, pointthe surplus part to the inner side.

L Pass the C.D.I. magneto lead (2leads) through the grommetside.

M Place the cover to the corner ofrectifier / regulator.

N No special order is set for theC.D.I. magneto lead (2 leads),neutral switch lead, starter motorlead and battery negative lead.

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Page 22: Yamha Tw 125 Manuel

INTRODUCTIONPERIODIC MAINTENANCE/LUBRICATION INTERVALS

CHKADJ

NOTE:

EAS00036

PERIODIC CHECKS AND ADJUSTMENTSINTRODUCTIONThis chapter includes all information necessary to perform recommended checks and adjustments. Iffollowed, these preventive maintenance procedures will ensure more reliable vehicle operation, alonger service life and reduce the need for costly overhaul work. This information applies to vehiclesalready in service as well as to new vehicles that are being prepared for sale. All service techniciansshould be familiar with this entire chapter.EAS00037

PERIODIC MAINTENANCE/LUBRICATION INTERVALS

The annual checks must be performed every year, except if a kilometer-based maintenance isperformed instead.

From 30,000 km, repeat the maintenance intervals starting from 6,000 km. Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,data and technical skills.

NO. ITEM CHECK OR MAINTENANCE JOB

ODOMETER READING( 1,000 km) ANNUAL

CHECK1 6 12 18 24

CHECK

1 * Fuel line Check fuel hoses for cracks or damage. √ √ √ √ √

2 Spark plug

Check condition. Clean and regap. √ √

p p g

Replace. √ √

3 * Valves Check valve clearance. Adjust. √ √ √ √

4 Air filter element Clean. √ √

4 Air filter element Replace. √ √

5 Clutch Check operation. Adjust. √ √ √ √ √

6 * Front brake Check operation, fluid level and vehicle for fluid leakage. √ √ √ √ √ √

6 * Front brake Replace brake pads. Whenever worn to the limit

7 * Rear brake Check operation and adjust brake pedal free play. √ √ √ √ √ √

7 * Rear brake Replace brake shoes. Whenever worn to the limit

8 * Brake hose Check for cracks or damage. √ √ √ √ √

8 * Brake hose Replace. Every 4 years

9 * Wheels Check runout, spoke tightness and for damage. Tighten spokes if necessary. √ √ √ √

10 * Tires

Check tread depth and for damage. Replace if necessary. Check air pressure. Correct if necessary.

√ √ √ √ √

11 * Wheel bearings Check bearing for looseness or damage. √ √ √ √

12 * Swingarm Check operation and for excessive play. √ √ √ √

12 * Swingarm Lubricate with lithium-soap-based grease. Every 24,000 km

13 Drive chain Check chain slack. Make sure that the rear wheel is properly aligned. Clean and lubricate.

Every 500 km and after washingthe motorcycle or riding in the rain

14 * Steering bearings Check bearing play and steering for roughness. √ √ √ √ √

14 * Steering bearings Lubricate with lithium-soap-based grease. Every 24,000 km

15 * Chassis fasteners Make sure that all nuts, bolts and screws are properlytightened. √ √ √ √ √

16 Sidestand Check operation. Lubricate. √ √ √ √ √

17 * Sidestand switch Check operation. √ √ √ √ √ √

18 * Front fork Check operation and for oil leakage. √ √ √ √

19 * Shock absorberassembly Check operation and shock absorber for oil leakage. √ √ √ √

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Page 23: Yamha Tw 125 Manuel

PERIODIC MAINTENANCE/LUBRICATION INTERVALSCHKADJ

NOTE:

NO. ITEM CHECK OR MAINTENANCE JOB

ODOMETER READING( 1,000 km) ANNUAL

CHECK1 6 12 18 24

CHECK

20 *Rear suspension relayarm and connecting

Check operation. √ √ √ √20 * arm and connecting

arm pivoting points Lubricate with lithium-soap-based grease. √ √

21 * Carburetor Check starter (choke) operation. Adjust engine idling speed. √ √ √ √ √ √

22 Engine oil Change. Check oil level and vehicle for oil leakage. √ √ √ √ √ √

23 Engine oil filterelement Clean. √ √ √

24 * Engine oil strainer Clean. √

25 * Front and rear brakeswitches Check operation. √ √ √ √ √ √

26 Moving parts andcables Lubricate. √ √ √ √ √

27 * Lights, signals andswitches

Check operation. Adjust headlight beam. √ √ √ √ √ √

The air filter needs more frequent service if you are riding in unusually wet or dusty areas. Hydraulic brake serviceRegularly check and, if necessary, correct the brake fluid level.Every two years replace the internal components of the brake master cylinder and caliper, andchange the brake fluid.

Replace the brake hoses every four years and if cracked or damaged.

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Page 24: Yamha Tw 125 Manuel

ADJUSTING THE ENGINE IDLING SPEEDCHKADJ

NOTE:

a

b

ENGINEEAS00054

ADJUSTING THE ENGINE IDLING SPEED

Prior to adjusting the engine idling speed, the airfilter should be clean, and the engine shouldhave adequate compression.

1. Start the engine and let it warm up for severalminutes.

2. Install:engine tachometer(to the spark plug lead)

Engine tachometer90890-03113

3. Measure:engine idling speedOut of specification Adjust.

Engine idling speed1,450 1,650 r/min

4. Adjust:engine idling speed

a. Turn the pilot screw 1 in or out until it is light-ly seated.

b. Turn the pilot screw out the specified numberof turns.

Pilot screw1-1/2 turns out

c. Turn the throttle stop screw 2 in direction aor b until the specified engine idling speed isobtained.

Direction Engine idling speed isincreased.

Direction Engine idling speed isdecreased.

5. Adjust: throttle cable free playRefer to “ADJUSTING THE THROTTLECABLE FREE PLAY”.

Throttle cable free play(at the flange of the throttle grip)

3 5 mm

–18–

Page 25: Yamha Tw 125 Manuel

ADJUSTING THE THROTTLE CABLE FREE PLAYCHKADJ

NOTE:

NOTE:

a

b

NOTE:

EAS00058

ADJUSTING THE THROTTLE CABLE FREEPLAY

Prior to adjusting the throttle cable free play, theengine idling speed should be adjusted.

1. Check: throttle cable free play aOut of specification Adjust.

Throttle cable free play(at the flange of the throttle grip)

3 5 mm

2. Adjust: throttle cable free play

When the motorcycle is accelerating, the accel-erator cable 1 is pulled.

Carburetor sidea. Loosen the locknut 2 on the decelerator

cable.b. Turn the adjusting nut 3 in direction a or b

to take up any slack on the decelerator cable.c. Loosen the locknut 4 on the accelerator

cable 1 .d. Turn the adjusting nut 5 in direction a or b

until the specified throttle cable free play isobtained.

Direction Throttle cable free playis increased.

Direction Throttle cable free playis decreased.

e. Tighten the locknuts.

If the specified throttle cable free play cannot beobtained on the carburetor side of the cable, usethe adjusting nut on the handlebar side.

Handlebar sidea. Slide back the rubber cover 1 .b. Loosen the locknut 2 .c. Turn the adjusting nut 3 in direction a or b

until the specified throttle cable free play isobtained.

–19–

Page 26: Yamha Tw 125 Manuel

ADJUSTING THE THROTTLE CABLE FREE PLAYCHKADJ

a

b

WARNING

Direction Throttle cable free playis increased.

Direction Throttle cable free playis decreased.

d. Tighten the locknut.

After adjusting the throttle cable free play,turn the handlebars to the right and to theleft to ensure that this does not cause the en-gine idling speed to change.

–20–

Page 27: Yamha Tw 125 Manuel

CHECKING AND CHARGING THE BATTERYCHKADJ

WARNING

CAUTION:

EAS00178

ELECTRICAL SYSTEMCHECKING AND CHARGING THE BATTERY

Batteries generate explosive hydrogen gasand contain electrolyte which is made of poi-sonous and highly caustic sulfuric acid.Therefore, always follow these preventivemeasures:Wear protective eye gear when handling orworking near batteries.

Charge batteries in a well-ventilated area.Keep batteries away from fire, sparks oropen flames (e.g., welding equipment,lighted cigarettes).

DO NOT SMOKE when charging or han-dling batteries.

KEEP BATTERIES AND ELECTROLYTEOUT OF REACH OF CHILDREN.

Avoid bodily contact with electrolyte as itcan cause severe burns or permanent eyeinjury.

First aid in case of bodily contact:ExternalSKIN – Wash with water.EYES – Flush with water for 15 minutes andget immediate medical attention.

InternalDrink large quantities of water or milk fol-lowed with milk of magnesia, beaten egg orvegetable oil. Get immediate medical atten-tion.

This is a sealed battery. Never remove thesealing caps because the balance betweencells will not be maintained and battery per-formance will deteriorate.

Charging time, charging amperage andcharging voltage for a MF battery are differ-ent from those of conventional batteries.The MF battery should be charged as ex-plained in the charging method illustra-tions. If the battery is overcharged, theelectrolyte level will drop considerably.Therefore, take special care when chargingthe battery.

–21–

Page 28: Yamha Tw 125 Manuel

CHECKING AND CHARGING THE BATTERYCHKADJ

Relationship between the open-circuit voltageand the charging time at 20C

Ope

n-ci

rcui

t vol

tage

(V

)

These values vary with the temperature, the condition ofthe battery plates, and the electrolyte level.

13.0

12.5

12.0

11.5

5 6.5 10Charging time (hours)

NOTE:

CAUTION:

NOTE:

Since MF batteries are sealed, it is not possibleto check the charge state of the battery by mea-suring the specific gravity of the electrolyte.Therefore, the charge of the battery has to bechecked by measuring the voltage at the batteryterminals.

1. Remove:seat

2. Disconnect:battery leads(from the battery terminals)

First, disconnect the negative lead 1 , thenthe positive lead 2 .

3. Remove:battery

4. Check:battery charge

a. Connect a pocket tester to the battery termi-nals.

Tester positive lead battery positive Tester positive lead terminalTester negative lead battery negative Tester negative lead terminal

The charge state of a MF battery can bechecked by measuring its open-circuit voltage(i.e., the voltage when the positive terminal isdisconnected).

No charging is necessary when the open-cir-cuit voltage equals or exceeds 12.8 V.

b. Check the charge of the battery, as shown inthe charts and the following example.

Examplec. Open-circuit voltage = 12.0 Vd. Charging time = 6.5 hourse. Charge of the battery = 20 30%

–22–

Page 29: Yamha Tw 125 Manuel

CHECKING AND CHARGING THE BATTERYCHKADJ

ChargingAmbient temperature 20C

Ope

n-ci

rcui

t vol

tage

(V

)

Check the open-circuitvoltage.

Time (minutes)

Ambienttemperature20C

Ope

n-ci

rcui

t vol

tage

(V

)

Charging condition of the battery (%)

WARNING

CAUTION:

5. Charge:battery(refer to the appropriate charging method il-lustration)

Do not quick charge a battery.

Make sure that the battery vent is free of ob-structions.

Never remove the MF battery sealing caps.Do not use a high-rate battery charger.They force a high-amperage current intothe battery quickly and can cause batteryoverheating and battery plate damage.

If it is impossible to regulate the chargingcurrent on the battery charger, be carefulnot to overcharge the battery.

When charging a battery, be sure to removeit from the motorcycle. (If charging has tobe done with the battery mounted on themotorcycle, disconnect the negative leadfrom the battery terminal.)

To reduce the chance of sparks, do notplug in the battery charger until the batterycharger leads are connected to the battery.

Before removing the battery charger leadclips from the battery terminals, be sure toturn off the battery charger.

Make sure that the battery charger leadclips are in full contact with the battery ter-minal and that they are not shorted. A cor-roded battery charger lead clip may gener-ate heat in the contact area and a weak clipspring may cause sparks.

If the battery becomes hot to the touch atany time during the charging process, dis-connect the battery charger and let the bat-tery cool before reconnecting it. Hot batter-ies can explode!

As shown in the following illustration, theopen-circuit voltage of a MF battery stabi-lizes about 30 minutes after charging hasbeen completed. Therefore, wait 30 min-utes after charging is completed beforemeasuring the open-circuit voltage.

–23–

Page 30: Yamha Tw 125 Manuel

CHECKING AND CHARGING THE BATTERYCHKADJ

Measure the open-circuitvoltage prior to charging.

Connect a charged andAMP meter to the batteryand start charging.

Make sure that the currentis higher than the standardcharging current written onthe battery.

By turning the chargingvoltage adjust dial, set thecharging voltage at 20 24 V.

Adjust the voltage so that thecurrent is at the standardcharging level.

Monitor the amperage for3 5 minutes to check if thestandard charging current isreached.

Set the time according to thecharging time suitable for theopen-circuit voltage.Refer to “Battery conditionchecking steps”.

If the current does notexceed the standardcharging current after 5minutes, replace the battery.

If charging requires more than 5 hours, it is advisable to check thecharging current after a lapse of 5 hours. If there is any change in theamperage, readjust the voltage to obtain the standard chargingcurrent.

Measure the battery open-circuit voltage after leaving the batteryunused for more than 30 minutes.12.8 V or more --- Charging is complete.12.7 V or less --- Recharging is required.Under 12.0 V --- Replace the battery.

YES NO

YES

NO

NOTE:Voltage should be measured 30minutes after the machine is stopped.

NOTE:Set the charging voltage at 16 17 V.(If the setting is lower, charging will beinsufficient. If too high, the battery willbe over-charged.)

Charging method using a variable voltage charger

–24–

Page 31: Yamha Tw 125 Manuel

CHECKING AND CHARGING THE BATTERYCHKADJ

Measure the open-circuitvoltage prior to charging.

Connect a charger andAMP meter to the batteryand start charging.

Make sure that the currentis higher than the standardcharging current written onthe battery.

Charge the battery until the battery’scharging voltage is 15 V. Charge thebattery until the battery’s chargingvoltage is 15 V.

This type of battery charger cannotcharge the MF battery. A variablevoltage charger is recommended.

Measure the battery open-circuitvoltage after leaving the batteryunused for more than 30 minutes.12.8 V or more --- Charging iscomplete.12.7 V or less --- Recharging isrequired.Under 12.0 V --- Replace the battery.

Set the charging time at 20 hours(maximum).

YES NO

NOTE:Voltage should be measured 30minutes after the machine is stopped.

NOTE:

Charging method using a constant voltage charger

–25–

Page 32: Yamha Tw 125 Manuel

CHECKING AND CHARGING THE BATTERYCHKADJ

CAUTION:

6. Check:battery ventObstruction Clean.Damage Replace.

7. Install:battery

8. Connect:battery leads(to the battery terminals)

First, connect the positive lead 1 , then thenegative lead 2 .

9. Check:battery terminalsDirt Clean with a wire brush.Loose connection Connect properly.

10. Lubricate:battery terminals

Recommended lubricantDielectric grease

11. Install:seat

–26–

Page 33: Yamha Tw 125 Manuel

REPLACING THE HEADLIGHT BULBCHKADJ

WARNING

CAUTION:

EAS00182

REPLACING THE HEADLIGHT BULB1. Remove:bolts 1headlight unit

2. Disconnect:headlight coupler 1headlight bulb cover 2

3. Remove:headlight bulb holder 1headlight bulb 2

Since the headlight bulb gets extremely hot,keep flammable products and your handsaway from the bulb until it has cooled down.

4. Install:headlight bulb NewSecure the new headlight bulb with the head-light bulb holder.

Avoid touching the glass part of the head-light bulb to keep it free from oil, otherwisethe transparency of the glass, the life of thebulb and the luminous flux will be adverselyaffected. If the headlight bulb gets soiled,thoroughly clean it with a cloth moistenedwith alcohol or lacquer thinner.

5. Install:headlight bulb holder

6. Connect:headlight bulb holderheadlight coupler

7. Install:headlight unit

–27–

Page 34: Yamha Tw 125 Manuel

ADJUSTING THE HEADLIGHT BEAMCHKADJ

a

b

a

b

EAS00184

ADJUSTING THE HEADLIGHT BEAM1. Adjust:headlight beam (vertically)

a. Turn the adjusting screw 1 in direction a orb .

Direction Headlight beam israised.

Direction Headlight beam islowered.

2. Adjust:headlight beam (horizontally)

a. Turn the adjusting knob 2 in direction a orb .

Direction Headlight beammovesto the right.

Direction Headlight beammovesto the left.

–28–

Page 35: Yamha Tw 125 Manuel

CLUTCH ENG

Order Job/Part Q’ty Remarks

123456789

1011

Removing the clutchClutch springsPressure plateFriction platesClutch platesNut/Lock washerClutch bossThrust washerClutch housingBallLong clutch push rodPush lever screw/Gasket

4154

1/111111

1/1

Remove the parts in the order listed.

Refer to “REMOVING/INSTALLINGTHE CLUTCH” section in chapter 4.(Manual No.: 5EK1-AE1)

8 Nm (0.8 mkg) 70 Nm (7.0 mkg)

12 Nm (1.2 mkg)

6 Nm (0.6 mkg)

EAS00274

ENGINECLUTCH

–29–

Page 36: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

12

13141516

1718

Push lever axle

Torsion springCirclipOil sealNut/Washer

Short clutch push rod/O-ringPush plate

1

111

1/1

1/11

Refer to “INSTALLING THE CLUTCH”section in chapter 4.(Manual No.: 5EK1-AE1)

Refer to “INSTALLING THE CLUTCH”section in chapter 4.(Manual No.: 5EK1-AE1)

For installation, reverse the removalprocedure.

8 Nm (0.8 mkg) 70 Nm (7.0 mkg)

12 Nm (1.2 mkg)

6 Nm (0.6 mkg)

CLUTCH ENG

–30–

Page 37: Yamha Tw 125 Manuel

CARBURETOR ENG

Order Job/Part Q’ty Remarks

1234

Removing the carburetorSide coverSeatFuel tank

Heater unit leadStarter cable

Carburetor joint clamp screwAir filter joint clamp screwCarburetor assemblyThrottle cables

1112

Remove the parts in order listed.

Disconnect the connector fromcarburetor.

Disconnect the starter cable.

For installation, reverse the removalprocedure.

NOTE:

Refer to “SEAT, FUEL TANK AND SIDECOVER” section in chapter 3. (Manual No.: 5EK1-AE1)

Loosen.

EAS00480

CARBURETORCARBURETOR

–31–

Page 38: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

Disassembly the carburetorVacuum chamber coverPiston valve springJet needle holderJet needle springJet needlePiston valveCarburetor heaterAdjusting screwDrain screwFloat chamberGasket

11111111111

Disassemble the parts in the order listed.

Refer to “ASSEMBLING THECARBURETOR”.

1234567891011

CARBURETOR ENG

EAS00483

–32–

Page 39: Yamha Tw 125 Manuel

CARBURETOR ENG

Order Job/Part Q’ty Remarks

Float pinFloatNeedle valveNeedle valve seatMain jetMain jet holderNeedle jetPilot jetPilot screwRubber diaphragm springRubber diaphragmStarter plunger

111111111111

For assembly, reverse the disassemblyprocedure.

Refer to “ASSEMBLING THECARBURETOR”.

121314151617181920212223

–33–

Page 40: Yamha Tw 125 Manuel

CARBURETOR CARB

EAS00485

CHECKING THE CARBURETOR1. Check:carburetor body float chamber jet housingCracks/damage Replace.

2. Check: fuel passagesObstruction Clean.

a. Wash the carburetor in a petroleum-basedsolvent. Do not use any caustic carburetorcleaning solution.

b. Blow out all of the passages and jets withcompressed air.

3. Check: float chamber bodyDirt Clean.

4. Check: float chamber rubber gasketCracks/damage/wear Replace.

5. Check: floatDamage Replace.

6. Check:needle valve 1needle valve seat 2Damage/obstruction/wear Replace theneedle valve, needle valve seat and O-ringas a set.

7. Check:O-ring 3Damage/wear Replace the needle valve,needle valve seat and O-ring as a set.

–34–

Page 41: Yamha Tw 125 Manuel

CARBURETOR CARB

8. Check:piston valve 1Damage/scratches/wear Replace.

rubber diaphragm 2Cracks/tears Replace.

9. Check:vacuum chamber cover 1piston valve spring 2 jet needle holder 3 jet needle spring 4Cracks/damage Replace.

10. Check: jet needle kit 1needle jet 2main jet 3main jet holder 4pilot jet 5pilot screw 6Bends/damage/wear Replace.Obstruction Clean.Blow out the jets with compressed air.

11. Check:piston valve movementInsert the piston valve into the carburetorbody and move it up and down.Tightness Replace the piston valve.

12 Check:starter plunger 1starter plunger spring 2Bends/cracks/damage Replace.

–35–

Page 42: Yamha Tw 125 Manuel

CARBURETOR CARB

CAUTION:

NOTE:

13. Check: fuel hosesCracks/damage/wear Replace.Obstruction Clean.Blow out the hoses with compressed air.

EAS00487

ASSEMBLING THE CARBURETOR

Befor assembling the carburetor, wash allof the parts in a petroleum-based solvent.

Always use a new gasket.

1. Install:needle jetmain jet 1main jet holder 2pilot jet 3

2. Install:needle valve seat 1

3. Install: float 1needle valve float pin 2

Install the float pin from the side opposite the ar-row.

–36–

Page 43: Yamha Tw 125 Manuel

CARBURETOR CARB

4. Install: float chamber 1pilot screw 2

5. Install:starter plunger kit 1

EAS00492

INSTALLING THE CARBURETOR1. Adjust:engine idling speed

Engine idling speed1,450 1,650 r/min

Refer to “ADJUSTING THE ENGINE IDLINGSPEED”

2. Adjust: throttle cable free play

Throttle cable free play(at the flange of the throttle grip)

3 5 mm

Refer to “ADJUSTING THE THROTTLECABLE FREE PLAY”.

EAS00498

MEASURING AND ADJUSTING THE FUELLEVEL1. Measure: fuel level aOut of specification Adjust.

Fuel level (below the float chambermating surface)

0 2.0 mm

–37–

Page 44: Yamha Tw 125 Manuel

CARBURETOR CARB

a. Stand the motorcycle on a level surface.b. Place the motorcycle on a suitable stand to

ensure that the motorcycle is standingstraight up.

c. Install the fuel level gauge 1 to the fuel drainpipe 2 .

Fuel level gauge90890-01312

d. Loosen the fuel drain screw 3 .e. Hold the fuel level gauge vertically next to the

float chamber.f. Measure the fuel level a .

2. Adjust: fuel level

a. Remove the carburetor.b. Check the needle valve seat and needle

valve.c. If either is worn, replace them as a set.d. If both are fine, adjust the float level by slight-

ly bending the float tang 1 .e. Install the carburetor.f. Measure the fuel level again.g. Repeat steps (a) to (f) until the fuel level is

within specification.

–38–

Page 45: Yamha Tw 125 Manuel

FRONT WHEEL AND BRAKE DISC CHAS

Order Job/Part Q’ty Remarks

1234567

Removing the front wheel and brakedisc

CapsSpeedometer cableWheel axleFront wheel assemblyCollarMeter gear unit assemblyBrake disc

2111111

Remove the parts in the order listed.

Place the motorcycle on a suitable standso that the front wheel is elevated.

For installation, reverse the removalprocedure.

NOTE:

Refer to “REMOVING/INSTALLING THEFRONT WHEEL” section in chapter 6.(Manual No.: 5EK1-AE1)

90 Nm (9.0 mkg)

13 Nm (1.3 mkg)

EAS00512

CHASSISFRONT WHEEL AND BRAKE DISC

–39–

Page 46: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

12345678

Removing the rear wheel

AdjusterBrake rodPinCompression springChain caseAxle nut/washerChain pullersWheel axle

11111

1/121

Remove the parts in the order listed.

Place the motorcycle on a suitable standso that the rear wheel is elevated.

Refer to “REMOVING/INSTALLING THEREAR WHEEL” section in chapter 6.(Manual No.: 5EK1-AE1)

NOTE:

90 Nm (9.0 mkg)

REAR WHEEL AND REAR BRAKE CHAS

REAR WHEEL AND REAR BRAKEREAR WHEEL

–40–

Page 47: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

9

10

Rear wheel assembly

Collar

1

2

Refer to “REMOVING /INSTALLING THEREAR WHEEL” section in chapter 6.(Manual No.: 5EK1-AE1)

For installation, reverse the removalprocedure.

90 Nm (9.0 mkg)

REAR WHEEL AND REAR BRAKE CHAS

–41–

Page 48: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

123

Removing the rear brake and rearwheel sprocketShoe plateNutsDriven sprocket

161

Remove the parts in the order listed.

For installation, reverse the removalprocedure.

Refer to “ASSEMBLYNG THE REARWHEEL” section in chapter 6.(Manual No.: 5EK1-AE1)

43 Nm (4.3 mkg)

REAR WHEEL AND REAR BRAKE CHAS

REAR BRAKE AND REAR WHEEL SPROCKET

–42–

Page 49: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

Disassembling the rear wheelBearingSpacerOil sealBearing

1111

Disassemble the parts in the order listed.

For assembly, reverse the disassemblyprocedure.

1234

REAR WHEEL AND REAR BRAKE CHAS

–43–

Page 50: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

12345678

Removing the front forkFront wheel

Brake hose holderCaliperFront fenderCap bolt /O-ringBolt (upper bracket)Bolts (under bracket)Front fork assembly (left)Front fork assembly (right)

111

1/11211

Remove the parts in the order listed.Refer to “FRONT WHEEL AND BRAKEDISC”.

For installation, reverse the removalprocedure.

Refer to “REMOVING/INSTALLINGTHE FRONT FORK” section in cahpter 6. (Manual No.: 5EK1-AE1)

Loosen the bolt.NOTE:

23 Nm (2.3 mkg)

23 Nm (2.3 mkg)

23 Nm (2.3 mkg)

30 Nm (3.0 mkg)

FRONT FORK CHAS

FRONT FORK

–44–

Page 51: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

1234567

Removing the handlebarMaster cylinder bracketMaster cylinderHousing (throttle grip)Throttle grip assemblyHandlebar switch (right)Clutch switchClutch cable

1111111

Remove the parts in the order listed.

Refer to “INSTALLING THEHANDLEBAR” section in chapter 6.(Manual No.: 5EK1-AE1)

20 Nm (2.0 mkg)

HANDLEBAR CHAS

HANDLEBAR

–45–

Page 52: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

89

101112

13

Handlebar switch (left)Grip (left)

Clutch leverStarter cable holderUpper holders

Handlebar

11

112

1

Refer to “REMOVING THE HANDLEBAR”section in chapter 6. (Manual No.: 5EK1-AE1)

For installation, reverse the removalprocedure.

Refer to “INSTALLING THE HANDLEBAR” section in chapter 6.(Manual No.: 5EK1-AE1)

20 Nm (2.0 mkg)

HANDLEBAR CHAS

–46–

Page 53: Yamha Tw 125 Manuel

Order Job/Part Q’ty Remarks

123456789

10111213

Removing the lower bracketFront forkHandlebarHeadlight unitHeadlight bodyTurn signal light assembly (left)Turn signal light assembly (right)Meter cable/Meter leadMeter assemblyHeadlight staySteering stem nutHandlebar crownLock washerUpper ring nutRubber washerLower ring nut

1111

1/112111111

Remove the parts in the order listed.Refer to “FRONT FORK”.Refer to “HANDLEBAR”

Disconnect the connector.

Refer to “INSTALLING THE STEERINGHEAD” section chapter 6. (Manual No.: 5EK1-AE1)

NOTE:

90 Nm (9.0 mkg)

1st 38 Nm (3.8 mkg)2nd 18 Nm (1.8 mkg)

STEERING HEAD CHAS

STEERING HEADLOWER BRACKET

–47–

Page 54: Yamha Tw 125 Manuel

STEERING HEAD CHAS

Order Job/Part Q’ty Remarks

14151617181920

Ball race ccverLower bracketBall race (upper)BallBallBall race (center)Ball race (lower)

111

221911

For installation, reverse the removalprocedure.

Refer to “INSTALLING THE STEERING”section in chapter 6. (Manual No.: 5EK1-AE1)

90 Nm (9.0 mkg)

1st 38 Nm (3.8 mkg)2nd 18 Nm (1.8 mkg)

–48–

Page 55: Yamha Tw 125 Manuel

IGNITION SYSTEM ELEC

1 C.D.I. magneto2 Neutral switch4 Battery6 Fuse10 Engine stop switch11 Main switch13 Diode14 C.D.I. unit15 Ignition coil16 Spark plug22 Neutral relay24 Reed switch

EAS00734

ELECTRLCAL SYSTEMIGNITION SYSTEMCIRCUIT DIAGRAM

–49–

Page 56: Yamha Tw 125 Manuel

IGNITION SYSTEM ELEC

NOYES

Make the speedometer indicateCheck the continuity or open circuit status. If it counts 4 cycles of continuity and openactions per speedometer rotation, the resultis acceptable.

Is the reed switch OK?

Replace the reedswitch.

Remove the meter assembly.Connect the pocket tester (Ω 1) to thereed switch coupler as shown.

1. Reed switch

EAS00798

Tester positive probe white/black Tester negative probe red/blue

12

Properly connect orrepair the ignitionsystem.

CHECKING THE IGNITION SYSTEM.1. The speedometer fail to come on.

–50–

Page 57: Yamha Tw 125 Manuel

COLOR CODEB Black. . . . . . . . .

Br Brown. . . . . . . . .

Ch Chocolate. . . . . . . .

Dg Dark green. . . . . . . .

G Green. . . . . . . . .

L Blue. . . . . . . . . .

O Orange. . . . . . . . .

1 C.D.I. magneto2 Neutral switch3 Rectifier /Regulator4 Battery5 Starter relay6 Fuse7 Starter motor8 Right handlebar switch9 Start switch10 Engine stop switch11 Main switch12 Clutch switch13 Diode14 C.D.I. unit15 Ignition coil16 Spark plug17 Thermo switch18 Carbuletor heater19 Horn20 Turn signal relay21 Sidestand switch22 Neutral relay23 Speedometer24 Reed switch25 Meter light26 Neutral indicator light27 Turn signal indicator light28 Hi-beam indicator light29 Left handlebar switch30 Horn switch31 Turn signal switch32 Light switch33 Dimmer switch34 Front brake light switch35 Rear brake light switch36 Rear turn signal light (right)37 Front turn signal light (right)38 Front turn signal light (left)39 Rear turn signal light (left)40 Headlight41 Auxiliary light42 Tail /Brake light

Sb Sky blue. . . . . . . .

P Pink. . . . . . . . .

R Red. . . . . . . . .

Y Yellow. . . . . . . . .

W White. . . . . . . . .

B/R Black/Red. . . . . .

B/W Black/White. . . . . .

Br/L Brown/Blue. . . . . .

Br/W Brown/White. . . . .

G/R Green/Red. . . . . .

G/W Green/White. . . . . .

G/Y Green/Yellow. . . . . .

L /B Blue/Black. . . . . . .

L /R Blue/Red. . . . . . .

L /W Blue/White. . . . . .

L /Y Blue/Yellow. . . . . . .

R/L Red/Blue. . . . . . .

R/W Red/White. . . . . .

W/B White/Black. . . . . .

W/L White/Blue. . . . . .

W/R White/Red. . . . . .

TW125 2002 WIRING DIAGRAM