10
TUNING THE CHASSIS
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10.1
Checking the basic chassis setting with the rider's weight
Info
When adjusting the basic chassis setting, first adjust the shock absorber and then the fork.
401030-01
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For optimal motorcycle riding characteristics and to avoid damage to forks, shock
absorbers, swingarm and frame, the basic settings of the suspension components
must match the rider's weight.
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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.)
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If the rider's weight is above or below this range, the basic setting of the suspen-
sion components must be adjusted accordingly.
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Small weight differences can be compensated by adjusting the spring preload, but
in the case of large weight differences, the springs must be replaced.
10.2
Air suspension AER 48
M01110-01
Air suspension
WP Performance Systems AER 48
is used in the fork.
In this system, suspension is located in the left fork leg and damping 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 signifi-
cantly 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 for the rider's weight, surface
conditions and the rider's preference using a fork pump. The fork does not have to
be detached. The time consuming 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 possi-
ble. 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.
The compression adjuster is located at the upper end of the right fork leg.
10.3
Compression damping of the shock absorber
The compression damping of the shock absorber is divided into two ranges: high-speed and low-speed.
High-speed and low-speed refer to the compression speed of the rear wheel suspension and not to the vehicle speed.
The high-speed setting, for example, has an effect on the landing after a jump: the rear wheel suspension compresses quickly.
The low-speed setting, for example, has an effect when riding over long ground swells: the rear wheel suspension compresses slowly.
These two ranges can be adjusted separately, although the transition between high-speed and low-speed is gradual. Thus, changes in
the high-speed range affect the compression damping in the low-speed range and vice versa.
