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MAINTENANCE WORK ON CHASSIS AND ENGINE »
Engine characteristic 250/300 SX/MXC/EXC*
The engine characteristic can be modified through various thicknesses of the
auxiliary spring [1]. An auxiliary spring designed for „good driveability“ (smooth
power application) is mounted in the condition at delivery.
One of the auxiliary springs can be mounted if you prefer an „even smoother
power application“ or an „aggressive engine characteristic“.
Auxiliary spring for good driveability (mounted in condition at delivery)
Spare part number 546.37.072.300, YELLOW color mark
Auxiliary spring for an even smoother power application (included in scope of
supply) Spare part number 548.37.072.100, GREEN color mark
Auxiliary spring for aggressive engine characteristic (included in scope of sup-
ply). Spare part number 548.37.072.000, RED color mark
To mount, tilt the motorcycle approx. 45° to the left, remove both screws [2],
lift off the closing cover [3] and remove the springs including the spring insert
[4] from the clutch cover. Pull both springs off the spring insert, mount the
red or the green auxiliary spring and the control spring [5] and slide both into
the clutch cover until the recess in the spring insert [4] engages in the rocker
arm. Check the O-ring in the closing cover mount the closing cover, ensuring
that the dolly screw [6] engages in the auxiliary spring.
Make sure you do not turn the dolly screw since this will impair the engine
characteristic.
If you prefer a smoother engine power application, you can mount a different
ignition rotor and a different exhaust. Ask your KTM dealer for more
information.
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