Yamaha SR125'99 3MW-AE3 Manuel utilisateur

FOREWORD

This Supplementary Service Manual has been prepared to introduce new service and data for the

SR125 ’99. For complete service information procedures it is necessary to use this Supplementary

Service Manual together with the following manual.

SR125 SERVICE MANUAL: 3MW-AE1

SR125 SUPPLEMENTARY SERVICE MANUAL: 3MW-AE2

SR125 ’99

SUPPLEMENTARY

SERVICE MANUAL

1998 by Yamaha Motor Co., Ltd.

First Edition, October 1998

Any reproduction or unauthorized use

without the written permission of

Yamaha Motor Co., Ltd. is expressly

prohibited.

NOTE:

CAUTION:

EB001000

NOTICE

This manual was produced by the Yamaha Motor Company primarily for use by Yamaha dealers and

their 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 Yamaha mo-

torcycleshasabasicunderstandingofthemechanicalideasandtheproceduresofmotorcyclerepair.

Repairs attempted by anyone without this knowledge are likely to render the motorcycle unsafe and

unfit for use.

YamahaMotorCompany,Ltd.iscontinuallystrivingtoimproveallitsmodels.Modificationsandsignifi-

cant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers and

will appear in future editions of this manual where applicable.

Designs and specifications are subject to change without notice.

IMPORTANT INFORMATION

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

The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR

SAFETY IS INVOLVED!

Failuretofollow WARNINGinstructionscouldresult insevereinjuryordeathto

thescooteroperator,abystanderoraperson inspecting orrepairingthescoot-

er.

ACAUTIONindicatesspecialprecautionsthatmustbe taken to avoid damage

to the scooter.

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

YP002000 HOW TO USE THIS MANUAL

MANUAL ORGANIZATION

This manual consists of chapters for the main categories of subjects. (See “Illustrated symbols”)

1st title 1: This is the title of the chapter with its symbol on the upper right corner of each page.

2nd title 2: This title indicates the section of the chapter and only appears on the first page of each

section. It is located in the upper left corner of the page.

3rd title 3: This title indicates a sub-section that is followed by step-by-step procedures accompa-

nied by corresponding illustrations.

EXPLODED DIAGRAMS

Tohepsidentifypartsandclarifyproceduresteps,thereareexplodeddiagramsatstartofeachremov-

al and disassembly section.

1. An easy-to-see exploded diagram 4is provided for disassembly and assembly jobs.

2. Numbers 5are given in the order of jobs in the exploded diagram. A number that is enclosed by a

circle indicates a disassembly step.

3. An explanation of jobs and notes is presented in an easy-to-read way by the use of symbol marks

6. The meanings of the symbol marks are given on the next page.

4. Ajob instructionchart 7accompaniestheexplodeddiagram,providingthe orderofjobs,namesof

parts, notes in jobs, etc.

5. Forjobsrequiring more information, the step-by-step formatsupplements8 are given in addition to

the exploded diagram and the job instruction chart.

24 25

2321

19 2018

16 1715

1413

11 12

GEN

INFO SPEC

ENG

CARB

ELECCHAS

COOL

INSP

ADJ

TRBL

SHTG

EB003000

ILLUSTRATED SYMBOLS

Illustrated symbols 1to 9are designed as

thumb tabs to indicate the chapter’s number

and content.

1General information

2Specifications

3Periodic inspection and adjustment

4Engine

5Cooling system

6Carburetion

7Chassis

8Electrical

9Troubleshooting

Illustrated symbols 10 to 17 are used to identify the

specifications appearing in the text.

10 Possible to maintain with engine mounted

11 Filling fluid

12 Lubricant

13 Special tool

14 Tightening

15 Wear limit, clearance

16 Engine speed

17 Ω, V, A

Illustratedsymbols 18 to 23 intheexplodeddia-

grams indicate the types of lubricants and lu-

brication points.

18 Apply engine oil

19 Apply gear oil

20 Apply molybdenum disulfide oil

21 Apply wheel bearing grease

22 Apply lightweight lithium-soap base grease

23 Apply molybdenum disulfide grease

Illustratedsymbols 24 to 25 intheexplodeddia-

gramsindicatethewheretoapplylockingagent

24 and when to install new parts 25 .

24 Apply locking agent (LOCTITE)

25 Use new one

CONTENTS

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAINTENANCE SPECIFICATIONS 2. . . . . . . . . . . . . . . . . . . . . . . . . . .

ENGINE 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHASSIS 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TIGHTENING TORQUES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

CHASSIS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CABLE ROUTING 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PERIODIC INSPECTIONS AND ADJUSTMENTS

CHECKING AND ADJUSTING THE STEERING HEAD 9. . . . . . . . . . . . .

CHECKING AND ADJUSTING THE STEERING HEAD 9. . . . . . . . .

ENGINE OVERHAUL

CYLINDER HEAD 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CYLINDER HEAD 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHECKING THE TIMING CHAIN TENSIONER 12. . . . . . . . . . . . . . . .

CYLINDER HEAD INSTALLATION 12. . . . . . . . . . . . . . . . . . . . . . . . . . .

CHASSIS

STEERING 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

UNDER BRACKET 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

’99 SR125 WIRING DIAGRAM

–1–

GENERAL SPECIFICATIONS SPEC

SPECIFICATIONS

GENERAL SPECIFICATIONS

Model SR125

Model code: 3MW8

Dimensions:

Overall height 1,100 mm

Chassis:

Caster angle

Trail 26.75

90 mm

Wheel travel:

Rear wheel travel 76 mm

Bulb wattage quantity:

Headlight

Auxiliary light

Tail/brake light

Flasher light

Meter light

High beam indicator

Neutral indicator

Turn indicator

12 V 60 W/55 W 1

12 V 4 W 1

12 V 5 W/21 W 1

12 V 21 W 4

14 V 3 W 1

12 V 1.7 W 1

–2–

MAINTENANCE SPECIFICATIONS SPEC

MAINTENANCE SPECIFICATIONS

ENGINE

Item Standard Limit

Cam chain:

Cam chain type/No. of links

Cam chain adjustment DID 25SH/104 ENDLESS

Automatic

SSS

Carburetor:

Engine idle speed 1,300 – 1,400 rpm SSS

CHASSIS

Item Standard Limit

Steering system:

Steering bearing type Angular bearing SSS

Front suspension:

Fork spring free length

Fitting length

Oil capacity

Oil level

Oil grade

353.4 mm

338.4 mm

0.187 L (187 cm3)

138 mm

Fork oil 10 W or equivalent

321 mm

SSS

ELECTRICAL

Item Standard Limit

Ignition coil:

Primary winding resistance

Secondary winding resistance 0.184 – 0.276 Ωat 20_C

6.32 – 9.48 kΩat 20_C

SSS

Flasher relay:

Type

Model/manufacturer

Flasher frequency

Full transistor type

FE246BH/DENSO

75 – 95 cycle/min

SSS

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