10 TUNING THE CHASSIS 39
10.12 Checking the basic setting of the fork
Info
For various reasons, no exact riding sag can be determined for the fork.
401000-01
(125/150 SX EU)
– Smaller differences in the rider's weight can be compensated for by the fork air
pressure.
– However, if the fork frequently bottoms out (hard end stop on compression), the
fork air pressure must be increased to avoid damage to the fork and frame.
(125/150 SX US, All 250/300 models)
– As with the shock absorber, smaller differences in the rider's weight can be
compensated by the spring preload.
– However, if the fork frequently bottoms out (hard end stop on compression),
harder springs must be fitted to avoid damage to the fork and frame.
10.13 Adjusting the fork air pressure (125/150 SX EU)
Warning
Danger of accident Modifications to the suspension setting may seriously alter the handling characteristic.
Extreme modifications to the suspension setting may cause a serious deterioration in the handling characteristic and overload
components.
– Only make adjustments within the recommended range.
– Ride slowly to start with after making adjustments to get the feel of the new handling characteristic.
Info
Check or adjust the air pressure at the earliest 5 minutes after switching off the engine.
The air suspension is located in the left fork leg. The pressure and rebound damping is located in the right fork leg.
Preparatory work
– Raise the motorcycle with a lift stand. ( p. 44)
S00861-10
Main work
–
Remove protection cap
.
–
Push fork pump
together fully.
Fork pump (79412966000)
– Connect the fork pump to the left fork leg.
The fork pump indicator switches on automatically.
A little air escapes from the fork leg when connecting.
Info
This is due to the volume of the hose and not due to a defect in the fork
pump or the fork.
Read the accompanying KTM PowerParts instructions.
– Adjust the air pressure as specified.
Guideline
Air pressure 8.2 bar (119 psi)
Gradual changing of the air pressure in
steps of
0.2 bar (3 psi)
Minimum air pressure 7 bar (102 psi)
Maximum air pressure 15 bar (218 psi)
Info
Never set the air pressure to a value outside the stated range.
– Disconnect the fork pump from the left fork.
When disconnecting, excess pressure will escape from the tube – the fork leg
does not lose any air.
The fork pump indicator switches off automatically after 80 seconds.
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