2012 YAMAHA YZ450F check engine

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Page 6 of 228

YAMAHA YZ450F 2012  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 228

YAMAHA YZ450F 2012  Owners Manual CONTENTS
CHAPTER 1
GENERAL INFOR-
MATION
LOCATION OF 
IMPORTANT LABELS ..... 1-1
DESCRIPTION ................. 1-5
CONSUMER 
INFORMATION................. 1-6
FEATURES....................... 1-7
INCLUD

Page 15 of 228

YAMAHA YZ450F 2012  Owners Manual 1-5
DESCRIPTION
DESCRIPTION
• The machine you have purchased may differ slightly from those shown in the following.
• Designs and specifications are subject to change without notice.
1. Clutch lev

Page 28 of 228

YAMAHA YZ450F 2012  Owners Manual 1-18
STARTING AND BREAK-IN
• Unlike a two-stroke engine, this 
engine cannot be kick started 
when the throttle is open be-
cause the kickstarter may kick 
back. Also, if the throttle is open 
the a

Page 29 of 228

YAMAHA YZ450F 2012  Owners Manual 1-19
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

Page 41 of 228

YAMAHA YZ450F 2012  Owners Manual 2-11
TIGHTENING TORQUES
TIGHTENING TORQUES
ENGINE
△- marked portion shall be checked for torque tightening after break-in or before each race.
ItemThread 
sizeQty Tightening torque Remarks
Spark pl

Page 57 of 228

YAMAHA YZ450F 2012  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 fact

Page 59 of 228

YAMAHA YZ450F 2012  Owners Manual 3-3
MAINTENANCE INTERVALS
AIR FILTER
Clean and lubricate●●Use foam air-filter oil or equivalent oil.
Replace●
OIL FILTER
Replace●●
ENGINE GUARD
Replace●Breakage
FRAME
Clean and inspect●
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