KTM 125 Duke Owner's Manual page 90

11 SERVICE WORK ON THE CHASSIS
A 0 0 A
B 0 0 0 B
1 2 3
–
Shift gear to neutral.
–
Pull the lower chain section with specified weight
Guideline
–
Measure the distance
»
18 19 20
401288-10
Weight, chain wear measurement

of 20 chain links in the lower chain section.
Info
Chain wear is not always even, so you should repeat this measurement at
different chain positions.

Maximum distance at the longest
chain section
If the distance  is greater than the specified measurement:
–
Change the power set.
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.

.
15 kg (33 lb.)
301.6 mm (11.874 in)
x
88