Adjusting The Chain Tension - KTM 250 EXC-F Owner's Manual

12 SERVICE WORK ON THE CHASSIS
12.38

Adjusting the chain tension

Warning
Danger of accidents Danger caused by incorrect chain tension.
–
If the chain is too taut, the components of the secondary power transmission (chain, engine sprocket, rear sprocket, bear-
ings in the transmission and in the rear wheel) will be under additional load. In addition to premature wear, this can cause
the chain or the countershaft of the transmission to break in extreme cases. If the chain is too loose, however, it may fall
off the engine sprocket or rear sprocket and block the rear wheel or damage the engine. Ensure that the chain tension is
correct and adjust it if necessary.
Main work
–
Pull the chain at the end of the chain sliding component upwards to measure chain

tension
Info
The lower chain section
When the chain guard is mounted, it must be possible to pull up the chain
at least to the point where it makes contact with chain guard
Chain wear is not always even, so you should repeat this measurement at
different chain positions.
Chain tension
» If the chain tension does not meet specifications:
–
Adjust the chain tension. (
M00102-10
Finishing work
–
Remove the motorcycle from the lift stand. (
Preparatory work
–
Raise the motorcycle with the lift stand. (
–
Check the chain tension. (
Main work
–
Loosen nut
–
Loosen nuts
–
Adjust the chain tension by turning adjusting screws
Guideline
Chain tension
Turn adjusting screws
left and right chain adjusters are in the same position relative to reference
marks 
–
Tighten nuts
–
Make sure that the chain adjusters

screws
–
Tighten nut
Guideline
Nut, rear wheel spindle
Info
K00136-10
The wide adjustment range of the chain adjusters (32 mm (1.26 in))
enables different secondary ratios with the same chain length.
Chain adjusters
Finishing work
–
Remove the motorcycle from the lift stand. (
.

must be taut.
p. 72)
p. 71)

.

.

on the left and right so that the markings on the
. The rear wheel is then correctly aligned.

.

.

.

can be turned by 180°.
55... 58 mm (2.17... 2.28 in)
p. 49)
p. 49)

left and right.
55... 58 mm (2.17... 2.28 in)
are fitted correctly on the adjusting
M20x1.5 80 Nm (59 lbf ft)
p. 49)
72

.