Honda CRF250X Owner's Manual & Competition Handbook page 101

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Removal, Cleaning & Replacement
For maximum service life, the drive chain should
be cleaned, lubricated, and adjusted before each
outing. Your CRF has an endless (riveted master
link) type chain. It should only be removed or
replaced by your Honda dealer.
The O-rings can be damaged by steam cleaning,
high pressure washers, and certain solvents.
1. Clean the side surfaces of the chain with a dry
cloth. Use a high flash point solvent such as
kerosene – not petrol.
Do not brush the rubber O-rings. Brushing
will damage them. Use of a solvent may also
damage the O-rings.
2. Replace the drive chain if it has damaged
rollers, loose fitting links, damaged O-rings,
or other wise appears unserviceable.
3. Measure the drive chain plate (1). If the drive
chain plate is worn anywhere to a thickness of
13.4 mm (0.53 in), the drive chain must be
replaced.
Replacement Chain:
Size/link: DID 520 MXV-116LE
(1)
(1) drive chain plate (inner)
4. Inspect the sprocket teeth for possible wear or
damage. Replace them if necessary.
Never install a new drive chain on badly worn
sprockets, or use new sprockets with a badly
worn drive chain. Both chain and sprockets
must be in good condition, or the new
replacement chain or sprocket(s) will wear
rapidly.
Excessively worn sprocket teeth have a
hooked, worn appearance. Replace any
sprocket, which is damaged or excessively
worn.
NOTICE
Use of a new chain with worn sprockets will
cause rapid chain wear.
13.4 mm
(0.53 in)
Drive Chain
5. Lubricate the drive chain.
6. Recheck chain slack and adjust if necessary.
Servicing Your Honda
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