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Chassis Adjustments
Adjustments for Competition 135
Chassis Adjustments
The following suggestions may improve a specific
concern. Subtle changes in overall handling may
also be noted.
If you have a problem with rear wheel traction,
raise the rear end of your CRF by increasing the
rear spring pre-load. Instead of running 3.9 in
(100 mm) of sag, you can run 3.5 in (90 mm) so the
rear of the bike will sit a little higher. This should
produce more traction because of the change to the
swingarm and the location of your CRF’s center of
gravity.
If you have a problem with the steering head
shaking when you use the front brake hard or if
your CRF wants to turn too quickly, lower the rear
of the motorcycle by reducing the rear spring pre-
load. This will increase fork rake and trail and
should improve stability in a straight line.
The effective suspension travel will be transferred
toward the firmer end of wheel travel.
Keep the race sag adjustment (page 122) in the
3.5 – 4.3 in (90 – 110 mm) range.
Standard Position
The position of the outer tubes in the clamps is not
adjustable. Align the top of the outer tube (1) with
the top of the upper fork clamp (2).
(STANDARD POSITION)
Adjusting your CRF’s wheelbase can offer subtle
changes in overall handling. You may adjust
wheelbase by adding or removing links on the
drive chain. If you change the wheelbase, be sure
to re-check race sag and adjust, if necessary.
In the past, a general rule was lengthen the
wheelbase to add straight line stability, shorten the
wheelbase to improve turning. However, we
suggest you do not lengthen the wheelbase of your
CRF unless you are racing on a track with more
fast sections than normal.
As a general recommendation, keep the wheelbase
as short as possible. This positions the wheels
closer together, improves turning response,
increase weighting (traction) on the rear wheel,
and lightens weighting on the front wheel.
With your CRF, you will probably find that the
standard setting or a shorter wheelbase will offer
more overall benefits.
Rear End
Fork Height/Angle
(1)
(2)
(3)
(1) top of outer tube
(2) upper fork clamp
(3) standard position
0 in (0 mm)
Wheelbase
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