Adjusting The Rear Shock Absorber High Compression Damping Force; Checking The Tire Pressure; Checking The Wheels; Checking And Adjusting The Steering Head - Yamaha YZ450F(X) Owner's Service Manual

• 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 punch
mark "b" on the high compression
damping adjuster.)
Standard position:
About 11 clicks out
* About 10 clicks out
* For EUROPE
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.
ADJUSTING THE REAR SHOCK
ABSORBER HIGH COMPRESSION
DAMPING FORCE
1. Adjust:
• High compression damping force
By turning the adjuster "1".
→
Stiffer "a" Increase the high
compression damping force.
(Turn the adjuster "1" in.)
→
Softer "b" Decrease the high
compression damping force.
(Turn the adjuster "1" out.)
Extent of adjustment:
Maximum Minimum
2 turns out
Fully turned in
(from maximum
position
position)
• STANDARD POSITION:
This is the position which is back
by the specific number of turns
from the fully turned-in position.
(Which align the punch mark "a"
on the adjuster with the punch
mark "b" on the adjuster body.)
Standard position:
About 1-1/2 turns out
* About 2 turns out
* For EUROPE
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.

CHECKING THE TIRE PRESSURE

1. Measure:
• Tire pressure
→
Out of specification
Standard tire pressure:
100 kPa (1.0 kgf/cm
15 psi)
• Check the tire while it is cold.
• Loose bead stoppers allow the tire
to slip off its position on the rim
when the tire pressure is low.
• A tilted tire valve stem indicates that
the tire slips off its position on the
rim.
• If the tire valve stem is found tilted,
the tire is considered to be slipping
off its position. Correct the tire posi-
tion.
3-19
CHECKING AND TIGHTENING THE
SPOKES
1. Inspect:
• Spokes "1"
Bend/damage
Loose spoke
2. Tighten:
• Spokes
Spokes:
Be sure to retighten these spokes be-
fore and after break-in. After a prac-
tice or a race check spokes for
looseness.

CHECKING THE WHEELS

1. Inspect:
• Wheel runout
Elevate the wheel and turn it.
Abnormal runout
Adjust.
2. Inspect:
• Bearing free play
2
,
Exist play
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Elevate the front wheel by placing
a suitable stand under the engine.
2. Check:
• Steering stem
Grasp the bottom of the forks and
gently rock the fork assembly
back and forth.
Free play
CHASSIS
→
Replace.
→
Retighten.
3 Nm (0.3 m•kg, 2.2
ft•lb)
→
Replace.
→
Replace.
→
Adjust steering head.