Yamaha YFM250XL(C) Service Manual page 213

FINAL DRIVE GEAR AND DRIVE SHAFT
Troubleshooting chart
When basic condition "a" and "b" above exist, check the following points:
Elevate and spin the front wheels. Feel
for wheel bearing damage.
Check the rear axle. Feel for bearing
damage.
Remove the rear axle. Check for axle
bearing damage.
Remove the drive shaft components.
YES
NO
NO
YES
YES
NO
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3.Inspect:
Oil leakage
By the following inspection steps.
*********************************
Oil leakage inspection steps:
Clean the entire machine thoroughly, then
dry it.
Apply a leak-localizing compound or dry
powder spray to the shaft drive.
Road test the machine long enough to
locate the leak.
Leakage → Inspect component housing,
gasket, and/or seal for dam-
age.
Damage → Replace component.
NOTE:
An apparent oil leak on a new or nearly
new machine may be the result of a rest
preventative coating or excessive seal
lubrication.
Always clean the machine and recheck the
suspected location of an apparent leak-
age.
*********************************
Replace the wheel bearing.
(refer to the "FRONT WHEELS AND
FRONT BRAKE" section in CHAPTER 7.
Rear axle bearings and drive shaft bear-
ings probably not damaged. Repeat test
or remove individual components.
Replace the rear axle bearing.
(refer to the "REAR WHEEL AND REAR
AXLE" section in CHAPTER 7.
DRIV
6