Yamaha 2004 WR250FS Owner's Service Manual page 97

SPROCKETS INSPECTION/DRIVE CHAIN INSPECTION
1
SPROCKETS INSPECTION
1. Inspect:
• Sprocket teeth a
Excessive wear → Replace.
NOTE:
Replace the drive sprocket, rear wheel
sprocket and drive chain as a set.
DRIVE CHAIN INSPECTION
1. Remove:
• Drive chain 1
NOTE:
Remove the drive chain using a drive chain
cutter 2.
2. Clean:
• Drive chain
Brush off as much dirt as possible. Then
clean the drive chain using the chain
cleaner.
CAUTION:
This machine has a drive chain with small
rubber O-rings 1 between the side plates.
Steam cleaning, high-pressure washes,
certain solvent and kerosene can damage
these O-rings.
3. Inspect:
• O-ring 1 (drive chain)
Damage → Replace the drive chain.
• Roller 2
• Side plate 3
Damage/wear → Replace the drive
chain.
4. Measure:
• Drive chain length (10 links) a
Out of specification → Replace.
Drive chain length (10 links):
<Limit>: 150.1 mm (5.91 in)
3 - 32
INSP
ADJ