Yamaha YZ250F(S) Owner's Service Manual page 222

SPROCKETS INSPECTION/DRIVE CHAIN INSPECTION
SPROCKETS INSPECTION
1. Inspect:
Sprocket teeth a
G
Excessive wear → Replace.
NOTE:
Replace the drive sprocket, rear wheel
sprocket and drive chain as a set.
EC369002
DRIVE CHAIN INSPECTION
1. Remove:
Master link clip
G
Joint 1
G
Drive chain 2
G
2. Clean:
Drive chain
G
Place it in kerosene, and brush off as
much dirt as possible. Then remove the
drive chain from the kerosene and dry
the drive chain.
3. Measure:
Drive chain length (10 links) a
G
Out of specification → Replace.
Drive chain length (10 links):
<Limit>: 152.5 mm (6.00 in)
4. Check:
Drive chain stiffness a
G
Clean and oil the drive chain and hold
as illustrated.
Stiff → Replace drive chain.
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