Yamaha XVS1100(L) Service Manual page 277

SHAFT DRIVE
Inspection notes
1. Investigate any unusual noises.
The following noises may indicate a me-
chanical defect:
a. A rolling "rumble" during coasting, accelera-
tion, or deceleration, (increases with the rear
wheel speed, but does not increase with
higher engine or transmission speeds).
Diagnosis: Possible wheel bearing damage.
b. A whining noise that varies with acceleration
and deceleration.
Diagnosis: Possible incorrect reassembly or
too little gear lash.
WARNING
Insufficient gear lash is extremely destruc-
tive to the gear teeth. If a test ride, following
reassembly, indicates these symptoms,
stop riding immediately to minimize gear
damage.
c. A slight "clunk" evident at low speed opera-
tion. (not to be confused with normal motor-
cycle operation)
Diagnosis: Possible broken gear teeth
WARNING
Stop riding immediately if broken gear teeth
are suspected. This condition could result
in the shaft drive assembly locking up, caus-
ing a loss of control and possible injury to
the rider.
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CHAS