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MAINTENANCE WORK ON CHASSIS AND ENGINE »
Exhaust system (LC4 Supermoto) *
640 Supermoto silencers are filled with glass-fiber yarn in the front and insu-
lation matting in the rear for dampening. The influence of heat causes the
glass-fiber yarn to become loose. This can lead to a loss of power and reduce
the silencer's dampening effect, therefore only the front glass-fiber yarn set
[1] must be replaced.
To replace, detach the silencer from the motorcycle and remove the front cap
[2]. Pull the front glass-fiber yarn set including the inner exhaust pipe [3] out
of the silencer. Clean the front inner exhaust pipe.
Slide a new set into the silencer.Replace O-Ring [4]. Then push the inner
exhaust pipe into the silencer and mount the cap.
THE EXHAUST SYSTEM BECOMES VERY HOT WHILE THE MOTORCYCLE IS RUN-
NING. TO AVOID BURNS DO NOT START WORK ON THE EXHAUST SYSTEM UNTIL
IT HAS PROPERLY COOLED DOWN.
Changing the original position of the clutch lever
The adjusting screw [5] can be used for individual adjustment of the original
position of the clutch lever, thus allowing adjustment to an optimal position
for every hand size.
Turning the adjusting screw counterclockwise reduces the distance between
the clutch lever and the handlebar. Turning the adjusting screw clockwise
increases the distance between the clutch lever and the handlebar.
ADJUSTMENT OF THE CLUTCH LEVER POSITION IS ONLY POSSIBLE WITHIN CER-
TAIN LIMITS. ONLY TURN THE ADJUSTING SCREW MANUALLY AND NEVER APPLY
EXCESSIVE FORCE.
Checking the oil level of the hydraulic clutch *
To check the oil level in the master cylinder of the clutch remove the cover.
For this purpose, remove screws [6] and cover [7] together with the rubber
boot [8]. The oil level in the horizontal-standing master cylinder should be 4
mm (0.16 in) below the upper edge.
If necessary, add SAE 10 biodegradable hydraulic oil (Motorex Kupplungsfluid
75), available from your authorized KTM workshop.
KTM USES BIODEGRADABLE, HYDRAULIC MINERAL OIL TO ACTUATE THE HYDRAULIC
CLUTCH. DO NOT MIX THIS OIL WITH ANY OTHER HYDRAULIC OIL. ALWAYS USE
ORIGINAL KTM HYDRAULIC OIL (AVAILABLE FROM YOUR AUTHORIZED KTM WORK-
SHOP) TO MAKE SURE YOUR CLUTCH OPERATES SMOOTHLY. NEVER REFILL WITH
BRAKE FLUID.
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