10
TUNING THE CHASSIS
27
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.
–
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 (SX
‑
F 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 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 con-
ditions and the rider's preference using a fork pump. The fork does not have to be dis-
mantled. 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 external mechanism. The suspension travel is maintained
as far as possible. The damping becomes harder and the riding comfort is reduced.
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.
