CHAIN DRIVE
4-31
ECA19090
• This vehicle has a drive chain with small
rubber O-rings “1” between the drive chain
side plates. Never use high-pressure water
or air, steam, gasoline, certain solvents
(e.g., benzine), or a coarse brush to clean
the drive chain. High-pressure methods
could force dirt or water into the drive
chain’s internals, and solvents will deterio-
rate the O-rings. A coarse brush can also
damage the O-rings. Therefore, use only
kerosene to clean the drive chain.
• Do not soak the drive chain in kerosene for
more than ten minutes, otherwise the O-
rings can be damaged.
4. Check:
• O-ring “1”
Damage Replace the drive chain.
• Drive chain roller “2”
Damage/wear Replace the drive chain.
• Drive chain side plate “3”
Damage/wear Replace the drive chain.
5. Lubricate:
• Drive chain
EAM30077
CHECKING THE DRIVE SPROCKET
1. Check:
• Drive sprocket
More than 1/4 tooth wear “a” Replace the
drive sprocket and the rear wheel sprocket as
a set.
Bent tooth Replace the drive sprocket and
the rear wheel sprocket as a set.
EAM30078
CHECKING THE REAR WHEEL SPROCKET
Refer to “CHECKING AND REPLACING THE
REAR WHEEL SPROCKET” on page 4-3.
EAM30558
INSTALLING THE DRIVE CHAIN (for YZ250)
1. Install:
• Master link “1”
• Master link plate “2”
• Master link clip “3”
ECA14310
• The closed end of the master link clip must
face in the direction of drive chain rotation.
• Never install a new drive chain onto worn
drive chain sprockets; this will dramatically
shorten the drive chain’s life.
G088940
G088941
Recommended lubricant
Chain lubricant suitable for O-
ring chains
b. Correct
1. Drive chain roller
2. Drive sprocket
G088904
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