Yamaha RS90NL, Suplementary Service Manual

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NOTICE
This manual was written by the Yamaha Motor Company primarily for use by Yamaha dealers and
their qualified mechanics. It is not possible to put an entire mechanic’s education into one manual,
so it is assumed that persons using this book to perform maintenance and repairs on Yamaha
snowmobiles have a basic understanding of the mechanical concepts and procedures inherent in
snowmobile repair. Without such knowledge, attempted repairs or service to this model may render
it unfit and/or unsafe to 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 models manufactured by
Yamaha. Modifications and significant changes in specifications or procedures will be forwarded to
all authorized Yamaha dealers and will, where applicable, appear in future editions of this manual.
HOW TO USE THIS MANUAL
Particularly important information is distinguished in this manual by the following notations:
The Safety Alert Symbol means ATTENTION! BE ALERT! YOUR SAFETY IS
INVOLVED!
Failure to follow WARNING instructions could result in severe injury or death to
the snowmobile operator, a bystander, or a person inspecting or repairing the
snowmobile.
A CAUTION indicates special precautions that must be taken to avoid damage
to the snowmobile.
A NOTE provides key information that can make procedures easier or clearer.
MANUAL FORMAT
All of the procedures in this manual are organized in a sequential, step-by-step format. The informa-
tion has been compiled to provide the mechanic with an easy to read, handy reference that contains
comprehensive explanations of all inspection, repair, assembly, and disassembly operations.
In this revised format, the condition of a faulty component will precede an arrow symbol and the
course of action required to correct the problem will follow the symbol, e.g.,
• Bearings
Pitting/damage
→
Replace.
EXPLODED DIAGRAM
Each chapter provides exploded diagrams before each disassembly section to facilitate correct dis-
assembly and assembly procedures.
WARNING
CAUTION:
NOTE: