Yamaha 2011 WR250FA Owner's Service Manual page 108

3. Clean:
• Drive chain
Brush off as much dirt as possible. Then
clean the drive chain using the chain clean-
er.
This machine has a drive chain with small
rubber O-rings "1" between the side plates.
Steam cleaning, high-pressure washes, cer-
tain solvent and kerosene can damage
these O-rings.
4. Inspect:
• O-ring "1" (drive chain)
Damage → Replace the drive chain.
• Roller "2"
• Side plate "3"
Damage/wear → Replace the drive chain.
5. Check:
• Drive chain stiffness "a"
Clean and oil the drive chain and hold as il-
lustrated.
Stiff → Replace the drive chain.
6. Install:
• Chain joint "1"
• O-ring "2"
• Drive chain "3"
• Link plate "4"
When installing the drive chain, apply the lithi-
um soap base grease on the chain joint and O-
rings.
7. Install:
• Link plate
• Press the link plate onto the chain joint using
a drive chain riveter "5".
• Rivet the end of the chain joint using a drive
chain riveter.
• After riveting the chain joint, make sure its
movement is smooth.
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CHASSIS