Checking The Chain Tension - Installing Rear Wheel; Checking Rear Sprocket / Engine Sprocket For Wear; Adjusting Chain Tension - KTM 50 SX Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE

Checking the chain tension - installing rear wheel

9.31
Warning
Danger of accidents Danger caused by incorrect chain tension.
–
If the chain tension is too high, the components of the secondary power train (chain, engine sprocket, rear sprocket, bear-
ings in transmission and rear wheel) are under additional load. Apart from premature wear, in extreme cases the chain can
rupture or the countershaft of the transmission can break. On the other hand, if the chain is loose, it can fall off the engine
sprocket or the rear sprocket and block the rear wheel or damage the engine. Check for correct chain tension and adjust if
necessary.

Checking rear sprocket / engine sprocket for wear

9.32

Adjusting chain tension

9.33
Warning
Danger of accidents Danger caused by incorrect chain tension.
–
If the chain tension is too high, the components of the secondary power train (chain, engine sprocket, rear sprocket, bear-
ings in transmission and rear wheel) are under additional load. Apart from premature wear, in extreme cases the chain can
rupture or the countershaft of the transmission can break. On the other hand, if the chain is loose, it can fall off the engine
sprocket or the rear sprocket and block the rear wheel or damage the engine. Check for correct chain tension and adjust if
necessary.
–
Make sure that the chain adjuster supports are fitted correctly on the adjusting
screws.
–
Push the chain at the end of the chain sliding component downwards to measure
the chain tension
Info
Lower chain section
Because chain wear is not always even, repeat this measurement at differ-
ent chain positions.
700483-01
Chain tension
» If the chain tension does not meet specifications:
–
Adjust the chain tension when installing the rear wheel. (
–
Check rear sprocket / engine sprocket for wear.
» If the rear sprocket / engine sprocket are worn:
–
Replace rear sprocket / engine sprocket.
400227-01
–
Check the chain guide for tightness and wear.
–
Jack up the motorcycle. (
–
Push the chain at the end of the chain sliding component downwards to measure
the chain tension
Info
Lower chain section
Because chain wear is not always even, repeat this measurement at differ-
ent chain positions.
700483-01
.

must be taut.

≥ 3 mm (≥ 0.12 in)
Info
When fitting the chain joint, always make sure that the closed side
of the joint faces forward (riding direction).
The engine sprocket, rear sprocket and chain should always be
replaced together.
p. 21)
.

must be taut.

34
p. 35)