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112 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 capacity are only felt during the final
3.9 in (100 mm) of fork travel.
• Compression damping — Turning the
compression damping adjuster adjusts how
quickly the fork compresses.
• Rebound damping — Turning the rebound
damping adjuster adjusts how quickly the fork
extends.
• Fork springs — Optional springs are
available in softer and stiffer types than the
standard rate. (page 169)
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)
(2)
(1) compression damping adjuster
(2) rebound damping adjuster
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 tire off the ground when
you release the pressure.
The standard air pressure is 0 psi (0 kPa, 0 kgf/
cm
2
). You may relieve accumulated air pressure
in the fork legs by using the fork air 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 an optional workstand under the
engine, so that the front wheel is 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 fork air pressure release screw (1).
3. Check that the O-ring (2) is in good
condition.
4. Install and tighten the fork air pressure
release screw to the specified torque:
0.9 lbf·ft (1.2 N·m, 0.1 kgf·m)
(1)
(2)
(1) fork air pressure release screw (2) O-ring
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 6 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 11 clicks.
Make sure that both fork legs are adjusted to the
same position.
17CRF450X31MEY710.indb112 2016/06/0811:46:10
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