Checking The Chain, Rear Sprocket, Engine Sprocket, And Chain Guide - KTM 125 SX Owner's Manual

11 SERVICE WORK ON THE CHASSIS
11.38

Checking the chain, rear sprocket, engine sprocket, and chain guide

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 chain adjusters
–
Tighten nut
Guideline
Nut, rear wheel spindle
Info
The wide adjustment range of the chain adjusters (32 mm) enables different
H00016-10
secondary ratios with the same chain length.
Chain adjusters
Finishing work
–
Remove the motorcycle from the lift stand. (
Preparatory work
–
Raise the motorcycle with a lift stand. (
Main work
–
Shift the transmission to idle.
–
Check the rear sprocket and engine sprocket for wear.
» If the rear sprocket and engine sprocket are worn:
–
Change the drivetrain kit.
400227-01
–
Pull at the top part of the chain with the specified weight
Guideline
Weight, chain wear measurement
–
Measure the distance
Info
Chain wear is not always even, so you should repeat this measurement at
different chain positions.
Maximum distance
chain section
»
If the distance
–
Change the drivetrain kit.
400987-10

.

.
 on the left and right so that the markings on the
. The rear wheel is now correctly aligned.

.

are fitted correctly on adjusting screws

.
 can be turned by 180°.
Info
The engine sprocket, rear sprocket, and chain should always be
replaced together.
 of 18 chain links in the lower chain section.

at the longest

is greater than the specified measurement:
Info
When the chain is replaced, the rear sprocket and engine sprocket
should also be changed.
New chains wear out faster on old, worn sprockets.

to the left and right.
55... 58 mm (2.17... 2.28 in)
M25x1.5 80 Nm (59 lbf ft)
p. 44)
p. 44)

.
10... 15 kg (22... 33 lb.)
272 mm (10.71 in)
68

.