Yamaha FJR1300A(X), Service Manual

Page: 291 / 754

SHAFT DRIVE
4-104
EAS23560
TROUBLESHOOTING
NOTE:
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.
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼▼ ▼▼ ▼
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
WARNING
EWA13780
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
WARNING
EWA13790
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.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲ ▲▲▲ ▲
Troubleshooting chart
When causes (A) or (B) shown in the table at the beginning of the “TROUBLESHOOTING” section ex-
ist, check the following points.
YES
→
NO
↓
Symptom Possible cause
1. A pronounced hesitation or jerky movement
during acceleration, deceleration or sus-
tained speeds (not to be confused with en-
gine 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
transmitted from the engine to the rear
wheel.
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 mov-
ing parts
1. Place the vehicle on a suitable
stand so that the front wheel is ele-
vated and then spin the front wheel.
Are the wheel bearings damaged? • Replace the wheel bearing(s).
• Refer to “FRONT WHEEL” on page 4-17.