KTM 85 SX 17/14 2021, Owner'S Manual

Page: 35 / 133

TUNING THE CHASSIS 10
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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.
–
This vehicle is delivered pre-set for a standard rider's weight
(with full protective clothing).
Guideline
Standard rider weight 45 … 55 kg (99 … 121 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 preload, but in the case of large weight differences, the
springs must be replaced.
10.2 Air suspension XACT 5543
Air suspension WP Suspension XACT 5543 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 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 pref-
erence using a fork airpump. The fork does not have to be dismantled. 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 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 adjustment is located at the upper end of the right fork leg.
The compression adjuster is located at the lower end of the right fork leg.