Checking The Chain Tension; Checking The Rear Sprocket/Engine Sprocket For Wear; Checking Chain Wear - KTM 125 EXC EU 2010 Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE

Checking the chain tension

11.41
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 the chain tension and correct if neces-
sary.

Checking the rear sprocket/engine sprocket for wear

11.42

Checking chain wear

11.43
–
Clean the chain regularly and then treat with chain spray.
Chain cleaner (
Off-road chain spray (
400725-01
–
Jack up the motorcycle. (
–
Push the chain at the end of the chain sliding component upwards to measure
chain tension
Info
The upper chain section
Chain wear is not always even, so you should repeat this measurement at
different chain positions.
Chain tension
400213-10
» If the chain tension does not meet specifications:
–
Adjust the chain tension. (
–
Remove the motorcycle from the work stand. (
–
Check the rear sprocket/engine sprocket for wear.
» If the rear sprocket/engine sprocket are worn:
–
Replace the rear sprocket/engine sprocket.
400227-01
–
Check the chain guide for tightness and wear.
–
Jack up the motorcycle. (
p. 132)
p. 132)
p. 38)
.

must be taut.

p. 56)
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. 38)
8... 10 mm (0.31... 0.39 in)
p. 38)
55