Yamaha WR450F, Owner'S Service Manual

Page: 264 / 794

3 - 32
INSP
ADJ
SPROCKETS INSPECTION/DRIVE CHAIN INSPECTION
EC368000
SPROCKETS INSPECTION
1. Inspect:
• Sprocket teeth
a
Excessive wear
→
Replace.
NOTE:
Replace the drive, driven sprockets and drive
chain as a set.
DRIVE CHAIN INSPECTION
1. Measure:
• Drive chain length (15 links)
a
Out of specification
→
Replace.
NOTE:
• While measuring the drive chain length, push
down on the drive chain to increase its ten-
sion.
• Measure the length between drive chain
roller
1
and
F
as shown.
• Perform this measurement at two or three
different places.
Drive chain length (15 links):
<Limit>: 239.3 mm (9.42 in)
2. Remove:
• Drive chain
1
NOTE:
Remove the drive chain using a chain cutter
2
.
3. Clean:
• Drive chain
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.
1