10 TUNING THE CHASSIS 30
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
– 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.
– 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 setting of the suspen-
sion components must be adjusted accordingly.
(125/150 SX EU)
– Weight differences can be compensated for by changing the fork air pressure.
(125/150 SX US, All 250/300 models)
– Smaller weight differences can be compensated by changing the spring
preload. In case of larger differences, matching springs must be fitted.
10.2 Air suspension AER 48 (125/150 SX EU)
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.
Info
A suitable fork pump is available within our KTM PowerParts range.
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.
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