Yamaha YZ450FA 2011 Owner's Service Manual page 99

CLEANING THE FRONT FORK OIL SEAL
AND DUST SEAL
1. Remove:
• Protector
• Dust seal "1"
Use a thin screw driver, and be careful not to
damage the inner fork tube and dust seal.
2. Clean:
• Dust seal "a"
• Oil seal "b"
• Clean the dust seal and oil seal after every
run.
• Apply the lithium soap base grease on the in-
ner tube.
RELIEVING THE FRONT FORK INTERNAL
PRESSURE
If the front fork initial movement feels stiff dur-
ing a run, relieve the front fork internal pres-
sure.
1. Elevate the front wheel by placing a suitable
stand under the engine.
2. Remove the air bleed screw "1" and release
the internal pressure from the front fork.
3. Install:
• Air bleed screw
Air bleed screw:
1 Nm (0.1 m•kg, 0.7 ft•lb)
ADJUSTING THE FRONT FORK REBOUND
DAMPING FORCE
1. Adjust:
• Rebound damping force
By turning the adjuster "1".
Stiffer "a" → Increase the rebound damp-
ing force. (Turn the adjuster "1" in.)
Softer "b" → Decrease the rebound damp-
ing force. (Turn the adjuster "1" out.)
Extent of adjustment:
Maximum
Fully turned in posi-
tion
• STANDARD POSITION:
This is the position which is back by the spe-
cific number of clicks from the fully turned-in
position.
Standard position:
10 clicks out
Do not force the adjuster past the minimum
or maximum extent of adjustment. The ad-
juster may be damaged.
Always adjust each front fork to the same
setting. Uneven adjustment can cause poor
handling and loss of stability.
3-28
CHASSIS
Minimum
20 clicks out (from
maximum position)