Checking The Chain Tension When Fitting Rear Wheel; Checking The Rear Sprocket / Engine Sprocket For Wear; Checking Chain Wear - KTM 450 SMR Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE

Checking the chain tension when fitting rear wheel

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 the rear sprocket / engine sprocket for wear

Checking chain wear

A 0 0 A
B 0 0 0 B
1 2 3 16 17 18
Make sure that the chain adjusters are fitted correctly on the adjusting screws.
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
500192-10
» If the chain tension does not meet specifications:
Adjust the chain tension when fitting rear wheel. (
Check the rear sprocket / engine sprocket for wear.
» If the rear sprocket / engine sprocket are worn:
Replace rear sprocket / engine sprocket.
Check that the chain guide is firmly seated and not worn.
400227-01
Jack up the motorcycle. (
Shift to neutral and pull the upper chain length with the specified tension
Specification
Chain tension
Measure distance
Info
Chain wear is not always even, so you should repeat this measurement at
different chain positions.
Maximum distance
chain section
» If distance
Replace the chain.
Remove the motorcycle from the work stand. (
400385-10
.
must be taut.
8... 10 mm (0.31... 0.39 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 re-
placed together.
P. 21)
10... 15 kg (22.05... 33.07 lb.)
of 18 chain links in the lower chain section.
at the longest 272 mm (10.71 in)
is greater than the specified measurement:
Info
When you replace the chain, you should also replace the rear and
engine sprockets.
New chains wear out faster on old, worn sprockets.
P. 37)
.
P. 21)
35