108
Adjustments for Competition
Front Suspension Adjustments
The front suspension can be adjusted for the
rider’s weight and riding conditions by using one
or more of the following methods:
• Oil volume — The effects of higher or lower
fork oil level are only felt during the final 100
mm (3.9 in) of fork travel.
• Compression damping — Turning the
compression damping screw adjusts how
quickly the fork compresses.
• Rebound damping — Turning the rebound
damping screw adjusts how quickly the fork
extends.
• Fork springs — Optional springs are
available in softer and stiffer types than the
standard rate. (page 161)
The inverted fork on your CRF features sealed
damper cartridges with dual (separate air and oil)
chambers to prevent aeration. The design also
isolates the oil in each fork tube/slider, which
may contain air bubbles and/or metal particles,
from the sealed cartridge to provide more
consistent damping.
(1) compression damping adjuster
(2) rebound damping adjuster
(1)
(2)
Front Suspension Air Pressure
Air is an unstable gas which builds up pressure
as it is worked (such as in a fork). Air pressure
acts as a progressive spring and affects the entire
range of fork travel. This means the fork action
on your CRF will get stiffer during a race. For
this reason, release built-up air pressure in the
fork legs between motos. Be sure the fork is
fully extended with the front tyre off the ground
when you release the pressure.
The standard air pressure is 0 kPa (0 kgf/cm
2
, 0
psi). You may relieve accumulated air pressure in
the fork legs by using the pressure release
screws. The front wheel should be off the ground
before you release the pressure. The air pressure
should be adjusted according to the altitude and
outside temperature.
1. Place your CRF on an optional workstand or
equivalent support with the front wheel off the
ground.
Do not adjust air pressure with the front wheel
on the ground as this will give false pressure
readings.
2. Remove the pressure release screw (1).
3. Check that the O-ring (2) is in good condition.
4. Install the pressure release screw to the
specified torque:
1.2 N·m (0.1 kgf·m, 0.9 lbf·ft)
(1) pressure release screw
(2) O-ring
(2)
(1)
Front Suspension Damping
Rebound Damping Adjustment
The fork rebound damping adjuster (1) has 16
positions or more. Turning the adjuster screw one
full turn clockwise advances the adjuster four
positions. To adjust the rebound damping to the
standard setting, proceed as follows:
Turn the adjuster clockwise until it will no longer
turn (lightly seats). This is the full hard position.
The adjuster is set in the standard position when
the adjuster is turned counterclockwise 7 clicks.
Make sure that both fork legs are adjusted to the
same position.
Compression Damping Adjustment
This adjustment affects how quickly the fork
compresses. The fork compression damping
adjuster (2) has 16 positions or more. Turning the
adjuster screw one full turn changes the adjuster
four positions. To adjust the compression
damping adjuster to the standard position,
proceed as follows:
Turn the adjuster clockwise until it will no longer
turn (lightly seats). This is the full hard position.
The adjuster is set in the standard position when
the adjuster is turned counterclockwise 14 clicks.
Make sure that both fork legs are adjusted to the
same position.
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Summary of Contents for CRF450X
Page 3: ...Honda CRF450X OWNER S MANUAL COMPETITION HANDBOOK Contents qxd 06 6 1 10 56 ページ2 ...
Page 12: ...6 Motorcycle Safety 001 030 qxd 06 6 1 10 57 ページ6 ...
Page 18: ...12 Before Riding 001 030 qxd 06 6 1 10 57 ページ12 ...
Page 28: ...22 Basic Operating Instructions 001 030 qxd 06 6 1 10 57 ページ22 ...
Page 156: ...150 Taking Care of Unexpected 142 168 qxd 06 6 1 11 08 ページ150 ...
Page 169: ...Technical Information 163 Wiring Diagram 142 168 qxd 06 6 1 11 08 ページ163 ...
