10 TUNING THE CHASSIS
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10.1 Checking the basic chassis setting with rider's weight
Info
When adjusting the basic chassis setting, first adjust the shock absorber and then the fork.
401030-01
– For optimal motorcycle riding characteristics and to avoid
damage to forks, shock absorbers, link fork and frame, the
basic settings of the suspension components must match the
rider's weight.
– As delivered, KTM offroad motorcycles are adjusted for an
average rider's weight (with full protective clothing).
Guideline
Standard rider weight 75 … 85 kg (165 …
187 lb.)
– If the rider's weight is above or below this range, the basic set-
ting of the suspension components must be adjusted accord-
ingly.
– Small weight differences can be compensated by adjusting
the spring pretension of the shock absorber, but in the case of
large weight differences, the springs must be replaced.
10.2 Air suspension XACT
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Air suspension WP XACT is used in the fork.
In this system, suspension is located in the left fork leg and damp-
ing in the right fork leg.
As fork springs are no longer required, a significant weight
advantage is achieved when compared to conventional forks. The
response on slightly uneven surfaces is significantly improved.
In normal driving mode, suspension is provided exclusively by an
air cushion. A steel spring is located in the left fork leg as an end
stop.
Info
If the fork is frequently overloaded, then the air pressure in
the fork must be increased to avoid damage to the fork and
frame.
The air pressure in the fork can be quickly adjusted to the rider's
weight, surface conditions and the rider's preference using a fork
airpump. The fork does not have to be dismantled. The time con-
suming mounting of harder or softer fork springs is not required.
If the air chamber loses air due to a damaged seal, the fork will
still not sag. In this case the air is retained in the fork. The
suspension travel is maintained as far as possible. The damping
becomes harder and the riding comfort reduces.
As with a conventional fork, the damping can be adjusted in
rebound and compression stages.
The rebound adjuster is located at the lower end of the right fork
leg.
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