2008 YAMAHA YZ450F Owners Manual

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YAMAHA YZ450F 2008  Owners Manual TABLE OF CONTENTS
GENERAL INFORMATION1
SPECIFICATIONS2
REGULAR INSPECTION AND 
ADJUSTMENTS
3
ENGINE4
CHASSIS5
ELECTRICAL6
TUNING7

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YAMAHA YZ450F 2008  Owners Manual CONTENTS
CHAPTER 1
GENERAL INFOR-
MATION
DESCRIPTION ................. 1-1
MACHINE
 IDENTIFICATION ............ 1-2
INCLUDED PARTS .......... 1-2
IMPORTANT 
INFORMATION................. 1-2
CHECKING O

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YAMAHA YZ450F 2008  Owners Manual 1-1
DESCRIPTION
GENERAL INFORMATION
DESCRIPTION
• The machine you have purchased may differ slightly from those shown in the following.
• Designs and specifications are subject to change without n

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YAMAHA YZ450F 2008  Owners Manual 1-2
MACHINE IDENTIFICATION
MACHINE IDENTIFICATION
There are two significant reasons for 
knowing the serial number of your 
machine:
1. When ordering parts, you can 
give the number to your Yamaha 
de

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YAMAHA YZ450F 2008  Owners Manual 1-3
CHECKING OF CONNECTION
and help assure that all parts are 
correctly reinstalled.
5. Keep away from fire.
ALL REPLACEMENT PARTS
1. We recommend to use Yamaha 
genuine parts for all replace-
ments.

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YAMAHA YZ450F 2008  Owners Manual 1-4
SPECIAL TOOLS
SPECIAL TOOLS
The proper special tools are necessary for complete and accurate tune-up and assembly. Using the correct special tool will 
help prevent damage caused by the use of imp

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YAMAHA YZ450F 2008  Owners Manual 1-5
SPECIAL TOOLS
Steering nut wrench
YU-33975, 90890-01403 This tool is used when tighten the 
steering ring nut to specification.
Cap bolt wrench
YM-01500, 90890-01500This tool is used to loosen or

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YAMAHA YZ450F 2008  Owners Manual 1-6
SPECIAL TOOLS
Tool name/Part number How to use Illustration
Clutch holding tool
YM-91042, 90890-04086This tool is used to hold the clutch 
when removing or installing the 
clutch boss securing nut
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