2008 YAMAHA YZ450F check engine

[x] Cancel search: check engine

Page 65 of 188

YAMAHA YZ450F 2008  Owners Manual 3-19
CHASSIS
• STANDARD POSITION:
This is the position which is back 
by the specific number of clicks 
from the fully turned-in position. 
(Which align the punch mark "a" 
on the adjuster with the

Page 68 of 188

YAMAHA YZ450F 2008  Owners Manual 3-22
ELECTRICAL
ELECTRICAL
CHECKING THE SPARK PLUG
1. Remove:
• Spark plug
2. Inspect:
• Electrode "1"
Wear/damage
→Replace.
• Insulator color "2"
Normal condition is a medium to 
light tan co

Page 74 of 188

YAMAHA YZ450F 2008  Owners Manual 4-6
RADIATOR
HANDLING NOTE
Do not remove the radiator cap 
when the engine and radiator are 
hot. Scalding hot fluid and steam 
may be blown out under pressure, 
which could cause serious injury. 
Whe

Page 78 of 188

YAMAHA YZ450F 2008  Owners Manual 4-10
CARBURETOR
HANDLING NOTE
Do not loosen the screw (throttle 
position sensor) "1" except when 
changing the throttle position sen-
sor due to failure because it will 
cause a drop in engine perfor

Page 85 of 188

YAMAHA YZ450F 2008  Owners Manual 4-17
CAMSHAFTS
Measurement steps:
a. Install the camshaft onto the cylin-
der head.
b. Position a strip of Plastigauge
® 
"1" onto the camshaft.
c. Install the clip, dowel pins and 
camshaft caps.

Page 93 of 188

YAMAHA YZ450F 2008  Owners Manual 4-25
VALVES AND VALVE SPRINGS
CHECKING THE VALVE SPRINGS
1. Measure:
• Valve spring free length "a"
Out of specification
→Replace.
2. Measure:
• Compressed spring force "a"
Out of specification

Page 96 of 188

YAMAHA YZ450F 2008  Owners Manual 4-28
CYLINDER AND PISTON
3. Measure:
• Ring end gap
Out of specification
→Replace.
You cannot measure the end gap on 
the expander spacer of the oil control 
ring. If the oil control ring rails sh

Page 99 of 188

YAMAHA YZ450F 2008  Owners Manual 4-31
CLUTCH
REMOVING THE CLUTCH BOSS
1. Remove:
•Nut "1"
• Lock washer "2"
• Clutch boss "3"
Straighten the lock washer tab and 
use the clutch holding tool "4" to hold 
the clutch boss.
A. For
Page:   < prev 1-8 9-16 17-24 25-32 33-40 next >