2008 YAMAHA YZ450F check engine

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Page 103 of 188

YAMAHA YZ450F 2008  Owners Manual 4-35
OIL FILTER ELEMENT AND WATER PUMP
REMOVING THE IMPELLER 
SHAFT
1. Remove:
• Impeller "1"
• Washer "2"
• Impeller shaft "3"
Hold the impeller shaft on its width 
across the flats "a" with sp

Page 106 of 188

YAMAHA YZ450F 2008  Owners Manual 4-38
BALANCER
REMOVING THE BALANCER
1. Straighten the lock washer tab.
2. Loosen:
• Nut (balancer) "1"
• Nut (primary drive gear) "2"
• Nut (balancer shaft driven gear) 
"3"
Place an aluminum pl

Page 109 of 188

YAMAHA YZ450F 2008  Owners Manual 4-41
OIL PUMP
CHECKING THE OIL PUMP
1. Inspect:
• Oil pump drive gear
• Oil pump drive shaft
• Rotor housing
• Oil pump cover
Cracks/wear/damage
→Replace.
2. Measure:
• Tip clearance "a"
(

Page 124 of 188

YAMAHA YZ450F 2008  Owners Manual 4-56
CRANKCASE AND CRANKSHAFT
DISASSEMBLING THE 
CRANKCASE
1. Separate:
• Right crankcase
• Left crankcase
Separation steps:
a. Remove the crankcase bolts, 
hose guide and clutch cable hold-
er.
L

Page 126 of 188

YAMAHA YZ450F 2008  Owners Manual 4-58
CRANKCASE AND CRANKSHAFT
5. Install:
• Dowel pin "1"
• O-ring "2" 
• Right crankcase
To left crankcase.
• Apply the lithium soap base grease 
on the O-ring.
• Fit the right crankcase on

Page 129 of 188

YAMAHA YZ450F 2008  Owners Manual 4-61
TRANSMISSION, SHIFT CAM AND SHIFT FORK
3. Install:
• Washer "1"
• Circlip "2" 
• Be sure the circlip sharp-edged cor-
ner "a" is positioned opposite side 
to the washer and gear "b".
• In

Page 155 of 188

YAMAHA YZ450F 2008  Owners Manual 5-26
HANDLEBAR
5. Install:
• Right grip "1"
•Collar "2"
Apply the adhesive on the tube 
guide "3".
• Before applying the adhesive, wipe 
off grease or oil on the tube guide 
surface "a" with a l

Page 172 of 188

YAMAHA YZ450F 2008  Owners Manual 6-2
IGNITION SYSTEM
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure 
and for checking t
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