YAMAHA YFM50S Service Manual – PDF DOWNLOAD

Description

YAMAHA YFM50S Service Manual – PDF DOWNLOAD

DESCRIPTION:

YAMAHA YFM50S Service Manual – PDF DOWNLOAD

INTRODUCTION :

• 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 vehicle has a basic understanding of the mechanical ideas and the procedures of vehicle
  repair. Repairs attempted by anyone without this knowledge are likely to render the vehicle unsafe
  and unfit for use.
• This model has been designed and manufactured to perform within certain specifications in regard
  to performance and emissions. Proper service with the correct tools is necessary to ensure that the
  vehicle will operate as designed. If there is any question about a service procedure, it is imperative
  that you contact a Yamaha dealer for any service information changes that apply to this model. This
  policy is intended to provide the customer with the most satisfaction from his vehicle and to conform
  to federal environmental quality objectives.
• 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.

HOW TO USE THIS MANUAL
MANUAL ORGANIZATION
This manual consists of chapters for the main categories of subjects. (See “symbols”)
1st title 1: This is the title of the chapter with its symbol in 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 accompanied
by corresponding illustrations.

TABLE OF CONTENTS:

YAMAHA YFM50S Service Manual – PDF DOWNLOAD

YFM50S Service Manual……………………………………………………….. 1
How to use this manual…………………………………………………… 4
Symbols………………………………………………………………… 5
Table of contents……………………………………………………….. 6
Chapter 1, General Information……………………………………………. 15
Machine identification……………………………………………….. 15
Important information………………………………………………… 16
Special tools……………………………………………………….. 19
Chapter 2, Specifications………………………………………………… 23
General specifications……………………………………………….. 23
Engine specifications………………………………………………… 26
Chassis specifications……………………………………………….. 33
Electrical specifications…………………………………………….. 34
Tightening torques…………………………………………………… 36
How to use the conversion table / general tightening torque specifications…. 39
Lubrication points and lubricant types…………………………………. 40
Oil flow diagrams……………………………………………………. 42
Cable routing……………………………………………………….. 44
Chapter 3, Periodic Checks and Adjustments…………………………………. 52
Periodic maintenance / lubrication…………………………………….. 52
Seat, fenders and fuel tank…………………………………………… 53
Engine……………………………………………………………… 58
Chassis…………………………………………………………….. 73
Electrical system……………………………………………………. 84
Chapter 4, Engine……………………………………………………….. 90
Cylinder head……………………………………………………….. 94
Camshaft, rocker arms and valves……………………………………….101
Cylinder and piston…………………………………………………..112
C.D.I. magneto……………………………………………………….119
Clutch………………………………………………………………122
Starter clutch and oil pump……………………………………………131
Shift shaft………………………………………………………….136
Crankcase……………………………………………………………138
Crankshaft…………………………………………………………..143
Transmission…………………………………………………………145
Middle gear………………………………………………………….149
Chapter 5, Carburetor…………………………………………………….156
Chapter 6, Drive Train……………………………………………………163
Rear axle / final drive assembly and drive shaft…………………………167
Chapter 7, Chassis……………………………………………………….176
Front and rear wheels…………………………………………………176
Front and rear brakes…………………………………………………181
Steering system………………………………………………………189
Front shock absorber assemblies and front swingarm……………………….199
Rear shock absorber and rear swingarm…………………………………..201
Chapter 8, Electrical…………………………………………………….204
Electrical components…………………………………………………204
Checking switch continuity…………………………………………….205
Checking the switches…………………………………………………206
Checking the bulbs and bulb sockets…………………………………….207
Ignition system………………………………………………………210
Electric starting system………………………………………………215
Starter motor………………………………………………………..221
Charging system………………………………………………………224
Signal system………………………………………………………..227
Chapter 9, Troubleshooting………………………………………………..230
Starting failure / hard starting……………………………………….230
Poor idle speed performance / poor medium and high-speed performance……….231
Faulty drive train……………………………………………………232
Faulty gear shifting / clutch slipping / dragging / overheating……………233
Faulty brake / shock absorber malfunction / unstable handling……………..234
Wiring Diagram…………………………………………………………..236

IMAGES PREVIEW OF THE MANUAL:

YAMAHA YFM50S SERVICE MANUAL – PDF DOWNLOAD:

PLEASE NOTE:

• This is the same manual used by the dealers to diagnose and troubleshoot your vehicle
• You will be directed to the download page as soon as the purchase is completed. The whole payment and downloading process will take anywhere between 2-5 minutes
• Need any other service / repair / parts manual, please feel free to contact [email protected] . We still have 50,000 manuals unlisted

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