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YFM660RNC
SERVICEMANUAL
LIT-11616-14-21
5LP-28197-E0
YFM660RN
395309702.092.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.
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 inspecting 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.
EB001000
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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 in the upper right corner of each page.
: 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.
2
: This title indicates a sub-section that is followed by step-by-step procedures accompa-
nied by corresponding illustrations.
3
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
. 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.
EB002000
2nd title
3rd title
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
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1
2
EB003000
ILLUSTRATED SYMBOLS
Illustrated symbols
GEN
INFO
SPEC
are printed on the
top right of each page and indicate the subject
of each chapter.
1
to
9
3
4
1
General information
CHK
ADJ
CHAS
2
Specifications
3
Periodic checks and adjustments
4
Chassis
5
Engine
5
6
6
Cooling system
7
Carburetion
ENG
COOL
8
Electrical
9
Troubleshooting
7
8
CARB
ELEC
+
9
0
are used to identify
the specifications appearing in the text.
0
to
G
TRBL
SHTG
0
Can be serviced with engine mounted
A
Filling fluid
Lubricant
B
A
B
C
Special tool
D
Torque
E
Wear limit, clearance
Engine speed
G
, V, A
C
D
E
F
G
H
I
J
Illustrated symbols H to N in the exploded
diagrams indicate the types of lubricants and
lubrication points.
E
G
M
H
Apply engine oil
K
L M N
I
Apply gear oil
J
Apply molybdenum disulfide oil
K
Apply wheel bearing grease
B
LS
M
S
L
Apply lightweight lithium soap base grease
M
Apply molybdenum disulfide grease
Apply silicon grease
Illustrated symbols
O
P
in the exploded
diagrams indicate where to apply a locking
agent
O
to
P
LT
New
O
and when to install a new part
P
.
O
Apply the locking agent (LOCTITE )
P
Replace
Illustrated symbols
F
N
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TABLE OF CONTENTS
GENERAL INFORMATION
GEN
INFO
1
SPECIFICATIONS
SPEC
2
PERIODIC CHECKS AND
ADJUSTMENTS
CHK
ADJ
3
CHASSIS
CHAS
4
ENGINE
ENG
5
COOLING SYSTEM
COOL
6
CARBURETION
CARB
7
+
ELECTRICAL
ELEC
8
TROUBLESHOOTING
TRBL
SHTG
9
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