Checking The Chain Tension; Checking The Chain Tension - Installing Rear Wheel; Checking Rear Sprocket / Engine Sprocket For Wear - KTM 50 SX MINI 2010 Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE

Checking the chain tension

9.32
Warning
Danger of accidents Danger caused by incorrect chain tension.
–
If the chain is over tensioned, 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 may
snap or the countershaft of the transmission can break. On the other hand, if the chain is loose, it may jump off the engine
sprocket or the rear sprocket, causing the rear wheel to lock or damage the engine. Check for correct chain tension and
adjust if necessary.

Checking the chain tension - installing rear wheel

9.33
Warning
Danger of accidents Danger caused by incorrect chain tension.
–
If the chain is over tensioned, 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 may
snap or the countershaft of the transmission can break. On the other hand, if the chain is loose, it may jump off the engine
sprocket or the rear sprocket, causing the rear wheel to lock or damage the engine. Check for correct chain tension and
adjust if necessary.

Checking rear sprocket / engine sprocket for wear

9.34
–
Jack up the motorcycle. (
–
Push the chain at the end of the chain sliding component upward to measure the
chain tension
Info
The upper chain section
Because chain wear is not always even, repeat this measurement at differ-
ent chain positions.
Chain tension
700483-01 » If the chain tension does not meet specifications:
–
Adjusting chain tension - after checking. (
–
Remove the motorcycle from the work stand. (
–
Make sure that the chain adjuster support plates are lying on the adjusting screws.
–
Push the chain at the end of the chain sliding component upward to measure the
chain tension
Info
The upper chain section
Because chain wear is not always even, repeat this measurement at differ-
ent chain positions.
Chain tension
700483-01
» 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.
p. 20)
.

must be taut.

.

must be taut.

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.
5... 8 mm (0.2... 0.31 in)
p. 35)
p. 20)
5... 8 mm (0.2... 0.31 in)
p. 36)
34