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YFM50S Service Manual
YFM50S
SERVICE MANUAL
LIT-11616-17-13
5YF-28197-10
719884712.059.png
EBS00001
YFM50S
SERVICE MANUAL
©2003 by Yamaha Motor Corporation, U.S.A.
First Edition, April 2003
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in U.S.A.
LIT-11616-17-13
719884712.070.png
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 machine has a basic understanding of the mechanical ideas and the procedures of
machine repair. Repairs attempted by anyone without this knowledge are likely to render the
machine unsafe and unfit for use.
Yamaha Motor Company, Ltd. is continually striving to improve all its models. Modifications and sig-
nificant 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.
EBS00003
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
Failure to follow WARNING instructions could result in severe injury or death
to the machine operator, a bystander or a person checking or repairing the
machine.
CAUTION:
A CAUTION indicates special precautions that must be taken to avoid dam-
age to the machine.
NOTE:
A NOTE provides key information to make procedures easier or clearer.
EBS00002
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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 accompa-
nied by corresponding illustrations.
EXPLODED DIAGRAMS
To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each
removal and disassembly section.
1. An easy-to-see exploded diagram 4 is provided for removal and disassembly jobs.
2. Numbers 5 are given in the order of the 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. A job instruction chart 7 accompanies the exploded diagram, providing the order of jobs, names
of parts, notes in jobs, etc.
5. For jobs requiring more information, the step-by-step format supplements 8 are given in addition
to the exploded diagram and the job instruction chart.
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1
2
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SYMBOLS
The following symbols are not relevant to
every machine.
Symbols 1 to 9 indicate the subject of each
chapter.
1
GEN
INFO
SPEC
3
4
CHK
ADJ
General information
ENG
2
Specifications
3
Periodic checks and adjustments
4
Engine
5
6
5
Carburetor
6
Drive train
CARB
DRIV
7
Chassis
8
Electrical
9
Troubleshooting
7
8
CHAS
ELEC
+
9
0
Symbols 0 to G indicate the following.
0
Serviceable with engine mounted
TRBL
SHTG
A
Filling fluid
B
Lubricant
C
Special tool
D
Torque
A
B
E
Wear limit, clearance
F
Engine speed
G
Electrical data (
, V, A)
C
D
E
F
G
H
I
J
Symbols H to M in the exploded diagrams
indicate the types of lubricants and lubrication
points.
H
E
G
M
Apply engine oil
I
Apply gear oil
K
L
M
J
Apply molybdenum disulfide oil
Apply wheel bearing grease
K
B
LS
M
L
Apply lithium-soap-based grease
M
Apply molybdenum disulfide grease
N
O
Symbols N to O in the exploded diagrams
indicate where to apply a locking agent N and
when to install a new part O .
N
LT
New
Apply the locking agent (LOCTITE ® )
O
Replace
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