Honda CRF125F 2022 Owner's Manual page 90

Removal and Cleaning:
When the drive chain becomes dirty, it should
be removed and cleaned prior to lubrication.
1. With the engine off, carefully remove the
master link retaining clip (1) with a pair of
pliers. Do not bend or twist the clip.
Remove the master link. Remove the drive
chain from the motorcycle.
2. Clean the drive chain in high flash-point
solvent and allow it to dry. Inspect the drive
chain for possible wear or damage. Replace
any chain that has damaged rollers, loose
fitting links, or otherwise appears
unserviceable.
Chain:
DID428HD
Never use petrol or low flash point solvents for
cleaning the drive chain. A fire or explosion
could result.
3. Inspect the sprocket teeth for possible wear
or damage.
4. Lubricate the drive chain (page 79).
80
5. Pass the chain over the sprockets and join
the ends of the chain with the master link.
For ease of assembly, hold the chain ends
against adjacent rear sprocket teeth while
inserting the master link.
The master link is the most critical part
affecting the security of the drive chain.
Master links are reusable, if they remain in
excellent condition, but it is recommended
that a new master link retaining clip be
installed whenever the drive chain is
reassembled.
Install the master link retaining clip so that
the closed end of the clip will face the
direction of forward wheel rotation.
(1) Retaining clip
(1)