Checking The Chain, Rear Sprocket, Engine Sprocket And Chain Guide - KTM 250 EXC-F 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 or engine sprocket is worn:
–
Change the drivetrain kit.
400227-01
–
Pull on the upper part of the chain with the specified weight
Guideline
Weight of 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 power set.
400987-10
–
Check the chain sliding guard for wear.
» If the bottom edge of the chain bolt is in line with or below the chain sliding
guard:
–
Change the chain sliding guard.
–
Check that the chain sliding guard is firmly seated.
» If the chain sliding guard is loose:
–
Tighten the screws on the chain sliding guard.
Guideline
Screw, chain sliding
guard
L02465-01
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.
M6
p. 49)

.
10... 15 kg (22... 33 lb.)
272 mm (10.71 in)
6 Nm Loctite
(4.4 lbf ft)
73
® 243™