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

12 SERVICE WORK ON THE CHASSIS
12.39

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

Preparatory work
–
Raise the motorcycle with the lift stand. (
Main work
–
Shift gear to neutral.
–
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 on the upper part of the chain with the specified weight
Guideline
Weight, chain wear measurement
–
Measure the distance
Info
Chain wear is not always even; repeat this measurement at different chain
positions.
Maximum distance
chain section
»
If the distance
–
Change the drivetrain kit.
400987-10
–
Check the chain sliding guard for wear.
» If the lower edge of the chain pins is in line with or below the chain sliding
guard:
–
Change the chain sliding guard.
–
Check the chain sliding guard for tightness.
» If the chain sliding guard is loose:
–
Tighten the screws on the chain sliding guard.
Guideline
Screw, chain sliding
guard
B00823-01
Info
The engine sprocket, rear sprocket, and chain should always be
changed together.

of 18 chain links in the lower chain section.

at the longest

is greater than the specified measurement:
Info
When you replace the chain, you should also change the rear
sprocket and engine sprocket.
New chains wear out faster on old, worn sprockets.
M6
p. 50)

.
10... 15 kg (22... 33 lb.)
272 mm (10.71 in)
6 Nm Loctite
(4.4 lbf ft)
70
® 243™