2008 YAMAHA YZ450F check engine

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Page 6 of 188

YAMAHA YZ450F 2008  Owners Manual FOREWORD
INTRODUCTION
Congratulations on your purchase of 
a Yamaha YZ series. This model is 
the culmination of Yamahas vast ex-
perience in the production of paceset-
ting racing machines. It repre

Page 10 of 188

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 1-9
STARTING AND BREAK-IN
If knocking or pinging occurs, use a 
different brand of gasoline or higher 
octane grade.
• For refueling, be sure to stop the 
engine and use enough care not 
to spill an

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YAMAHA YZ450F 2008  Owners Manual 1-10
STARTING AND BREAK-IN
the engine stop switch. Then, re-
start the engine and check its op-
eration within no more than 5 
minutes after it is restarted.
4. Operate the machine in the lower 
gears

Page 21 of 188

YAMAHA YZ450F 2008  Owners Manual 1-11
TORQUE-CHECK POINTS
TORQUE-CHECK POINTS
Concerning the tightening torque, refer to "TIGHTENING TORQUES" section in the CHAPTER 2.
Frame construction Frame to rear frame
Combined seat and fuel tan

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YAMAHA YZ450F 2008  Owners Manual 2-10
TIGHTENING TORQUES
ELECTRICAL
TIGHTENING TORQUES
ENGINE
△- marked portion shall be checked for torque tightening after break-in or before each race.
Item Standard Limit
Ignition system:
Advance

Page 47 of 188

YAMAHA YZ450F 2008  Owners Manual 3-1
MAINTENANCE INTERVALS
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind that such factors

Page 50 of 188

YAMAHA YZ450F 2008  Owners Manual 3-4
PRE-OPERATION INSPECTION AND MAINTENANCE
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating condition.
Be
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