Yamaha WR450F(R) Owner's Service Manual page 246

SPROCKETS INSPECTION/DRIVE CHAIN INSPECTION
1
EC368000
SPROCKETS INSPECTION
1. Inspect:
Sprocket teeth a
G
Excessive wear → Replace.
NOTE:
Replace the drive, driven sprockets and drive
chain as a set.
DRIVE CHAIN INSPECTION
1. Remove:
Drive chain 1
G
NOTE:
Remove the drive chain using a chain cutter
2.
2. Clean:
Drive chain
G
Brush off as much dirt as possible.
Then clean the 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)
G
Damage → Replace the drive chain.
Roller 2
G
Side plate 3
G
Damage/wear → Replace the drive
chain.
4. Measure:
Drive chain length (10 links) a
G
Out of specification → Replace.
Drive chain length (10 links):
<Limit>: 150.1 mm (5.91 in)
3 - 33
INSP
ADJ