Yamaha XVS650 Service Manual page 255

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Inspection notes
1.1nvestigate any unusual noises.
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The following noises may indicate a
mechanical defect:
a.A rolling "rumble" during coasting, accel-
eration, or deceleration. The noise
increases with rear wheel speed, but does
not increase with higher .engine or trans-
mission speeds.
Diagnosis: Possible wheel bearing dam-
age
b.A whining noise that varies with accelera-
tion and deceleration.
Diagnosis: Possible incorrect reassembly,
too little gear lash
Insufficient gear lash is extremely destruc-
tive to the gear teeth. If a test ride follow-
ing reassembly indicates this condition,
stop riding immediately to minimize gear
damage.
c.A slight "clunk" evident at low speed
operation. This noise must be distin-
guished from normal motorcycle opera-
tion.
Diagnosis: Possible broken gear teeth
A
WARNING
Stop riding immediately if broken gear
teeth are suspected. This condition could
result in a locking of the shaft drive assem-
bly
I
causing loss of control of the motorcy-
cle and possible injury to the rider.
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2.1nspect:
• Drained oil
Drained oil contains a large amount of
metal particles
-?
Check the bearing for
seizure.
NOTE: _
A small amount of metal particles in the oil
is normal.