Honda XRM125 CFT125 2020 Owner's Manual page 71

If a torque wrench was not used for
installation, see your dealer as soon as
possible to verify proper assembly.
Improper assembly may lead to loss of
braking capacity.
Drive Chain Adjusting the Drive Chain Slack
u
# Checking the Drive Chain Wear
If the drive chain slack is excessive when the
rear axle is moved to the furthest limit of
adjustment, the drive chain is worn and must
be replaced.
Chain:
DID420AD2
KMC420JB
RK420EL
If necessary have the drive chain replaced by
your dealer.
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