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124 Servicing Your Honda
Drive Chain
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 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 or Pro Honda chain cleaner – not
gasoline. 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
otherwise appears unserviceable.
3. Measure the drive chain plate (1). If the height
of any of the drive chain plates is less than
0.52 inch (13.3 mm), the drive chain must be
replaced.
Chain:
4. Inspect the sprocket teeth for wear or damage.
We recommend replacing the sprocket
whenever a new chain is installed.
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.
Use of a new chain with worn sprockets will cause
rapid chain wear.
5. Lubricate the drive chain (page 123).
6. Recheck chain slack and adjust if necessary.
Removal, Cleaning & Replacement
(CRF450RX)
Size/link:
RK520EXU/114LE
(1) drive chain plate (inner)
(1)
0.52 in (13.3 mm)
Normal Sprocket Teeth
Damaged Sprocket
Teeth
Worn Sprocket
Teeth
REPLACEREPLACE
GOOD
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