Troubleshooting - Yamaha FJR13AG Service Manual

EAS30238

TROUBLESHOOTING

Symptom
1. A pronounced hesitation or jerky movement
during acceleration, deceleration or sustained
speeds (not to be confused with engine surging
or transmission-related movements).
2. A rolling "rumble" noticeable at low speeds, a
high-pitched whine or a "clunk" from a shaft drive
component, or from the vicinity of the shaft drive.
3. The shaft drive is locked up or no power is trans-
mitted from the engine to the rear wheel.
TIP
Causes A, B and C may be extremely difficult to diagnose. The symptoms are quite subtle and difficult
to distinguish from normal operating noises. If there is reason to believe that these components are
damaged, remove them and check them individual.
Inspection notes
1. Investigate any unusual noises.
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The following noises may indicate a mechanical defect:
a. A rolling "rumble" during coasting, acceleration or deceleration (increases with the rear wheel speed,
but does not increase with higher engine or transmission speeds).
Wheel bearing damage
b. A whining noise that varies with acceleration and deceleration
Incorrect reassembly or too little gear backlash
EWA13780
WARNING
Insufficient gear backlash is extremely destructive to the gear teeth. If a test ride, following re-
assembly, indicates these symptoms, stop riding immediately to minimize gear damage.
c. A slight "clunk" evident at low speed operation (not to be confused with normal vehicle operation).
Broken gear teeth
EWA13790
WARNING
Stop riding immediately if broken gear teeth are suspected. This condition could result in the
shaft drive assembly locking up, causing a loss of control and possible injury to the rider.
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A. Bearing damage
B. Improper gear backlash
C. Damaged gear teeth
D. Broken drive shaft
E. Broken gear teeth
F. Seizure due to lack of lubrication
G. Small foreign objects lodged between moving
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4-142
Possible cause
parts
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SHAFT DRIVE
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