KTM 390 DUKE 2021 Owner's Manual page 133

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Shift the transmission into neutral.
Pull on the lower chain section with the specified weight
Guideline
Weight, chain wear measure-
ment
Measure distance
section.
Info
Chain wear is not always even, so you should repeat
this measurement at different chain positions.
Maximum distance
20 chain rollers at the
longest chain section
»
If distance
Change the drivetrain kit.
401288-10
SERVICE WORK ON THE CHASSIS 12
15 kg (33 lb.)
B
of 20 chain rollers in the lower chain
301.6 mm (11.874 in)
B
from
B
is greater than the specified measurement:
Info
When a new chain is mounted, the rear sprocket
and engine sprocket should also be changed.
New chains wear out faster on old, worn sprock-
ets.
A
.
131

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