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94 Adjustments for Competition
Refer to Safety Precautions on page 19.
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 3.9
in (100 mm) 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 144).
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:
1.0 lbf·ft (1.3 N·m, 0.1 kgf·m)
(1) fork air pressure release screw (2) O-ring
Front Suspension Oil Level
• If your CRF is brand-new, put enough part-
throttle break-in time (about 1 hour) on it to
ensure that the suspension has worked in.
• For optimum performance, and extended fork
life, the fork should be completely
disassembled and cleaned after the first 3
hours of riding. See the Service Manual or
your dealer for this service.
1. Place your CRF on an optional workstand or
equivalent support with the front wheel off the
ground.
2. Loosen the fork bridge upper pinch bolts (1)
(before loosening the fork caps to avoid
damaging the fork caps).
3. Loosen the fork caps (2), but do not remove
them yet.
Using an adjustable wrench to loosen the fork
caps may damage them.
(1) fork bridge upper pinch bolt (2) fork cap
NOTICE
Front Suspension Adjustments
(2)
(1)
(2)
(1)
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