Yamaha TW 125 Service Manual - 1999

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TW125 SERVICE MANUAL 1998 by Yamaha Motor Co., Ltd. 1st Edition, July 1998 All rights reserved. Any reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd. is expressly prohibited.

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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 motorcycle has a basic understanding of the mechanical ideas and the procedures of motorcycle repair. Repairs attempted by anyone without this knowledge are likely to render the motorcycle unsafe and unfit for use. Yamaha Motor Company, Ltd., is continually striving to improve all its models. Modifications and significant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers and will appear in future editions of this manual where applicable. NOTE: Designs and specifications are subject to change without notice. EAS00004

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!

WARNING

CAUTION: NOTE:

Failure to follow WARNING instructions could result in severe injury or death to the motorcycle operator, a bystander or a person inspecting or repairing the motorcycle. A CAUTION indicates special precautions that must be taken to avoid damage to the motorcycle. A NOTE provides key information to make procedures easier or clearer.

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HOW TO USE THIS MANUAL This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive explanations of all installation, removal, disassembly, assembly, repair and inspection procedures are laid 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 each page 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 each page, 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 each removal and disassembly section. 5 Numbers are given in the order of the jobs in the exploded diagram. A circled number indicates a disassembly 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 of parts, notes in jobs, etc. 8 Jobs requiring more information (such as special tools and technical data) are described sequentially.

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1

4

3

8 5

6

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1

SYMBOLS

2

GEN INFO

SPEC

3

4

CHK ADJ

ENG

The following symbols are not relevant to every vehicle. Symbols 1 to 9 indicate the subject of each chapter. 1 General information 2 Specifications

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3 Periodic inspections and adjustments 4 Engine

CHAS

5 Carburetor(-s) 6 Chassis

7

8

7 Electrical system 8 Troubleshooting

ELEC

TRBL SHTG

9

10

5

CARB

Symbols 9 to 16 indicate the following. 9 Serviceable with engine mounted 10 Filling fluid 11