Honda CRF250F Owner's Manual Installation And Operation page 197

Removal, Cleaning and Replacement:
Your motorcycle has an endless (reveted
master link) type chain. It should only be
removed or replaced by your dealer.
When the drive chain becomes dirty, it
should be removed and cleaned prior to
lubrication.
1. Clean the side surfaces of the chain with
a dry cloth. Do not brush the rubber O-
rings. Brushing will damage them. Use
of a solvent may also damage the O-
rings.
2. Inspect the drive chain for possible wear
or damage. Replace any chain that has
damaged rollers, loose fitting links, or
otherwise appears unserviceable.
Chain:
DID 520VD2
Never use petrol or low flash point solvents
for cleaning the drive chain. A fire or
explosion could result.
72
3. Inspect the sprocket teeth for possible
wear or damage. Replace if necessary.
4. Lubricate the drive chain (page 71).