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146 Tips
Troubleshooting
• Incorrect spark plug
heat range
• Incorrect spark plug gap
• Plug not serviced
frequently enough
POOR PERFORMANCE AT LOW AND IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check the spark
plug condition
(P.67)
CORRECT
INCORRECT
• Faulty ECM
*
• Faulty CKP sensor
*
WEAK OR
INTERMITTENT
SPARK
6. Try spark test
*
• Faulty, carbon or wet
fouled spark plug (P.67)
• Faulty ECM
*
• Faulty alternator
*
• Faulty ignition coil
*
• Broken or shorted
spark plug wire.
• Faulty CKP sensor
*
• Loose or disconnected
ignition system wires
• Faulty engine stop
button
*
• Faulty regulator/rectifier
*
• Faulty condenser
*
2. Check the ignition
timing
*
CORRECT
INCORRECT
• Faulty fuel pump unit
*
• Clogged fuel pump filter
(P.44)
4. Check the fuel
pump operation
and inspect the
fuel flow
*
CORRECT
INCORRECT
• Faulty PGM-FI system
(P.9)
3. Check the PGM-FI
system (P.7)
CORRECT
INCORRECT
• Loose insulator
• Damaged insulator
5. Check the insulator
for leaks
CORRECT
INCORRECT
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Check the ignition
timing
*
CORRECT
INCORRECT
2. Remove the air
cleaner (P.56)
AIR CLEANER
NOT DIRTY
DIRTY
WEAK OR
INTERMITTENT
SPARK
GOOD SPARK
6. Try spark test
*
• Faulty ECM
*
• Faulty CKP sensor
*
• Not cleaned frequently
enough
• Faulty camshaft
*
• Faulty valve springs
*
• Faulty, carbon or wet
fouled spark plug (P.67)
• Faulty ECM
*
• Faulty alternator
*
• Faulty ignition coil
*
• Broken or shorted
spark plug wire.
• Faulty CKP sensor
*
• Loose or disconnected
ignition system wires
• Faulty engine stop
button
*
• Faulty regulator/rectifier
*
• Faulty condenser
*
• Camshaft not installed
properly (P.73)
• Faulty PGM-FI system
(P.9)
3. Check the PGM-FI
system (P.7)
CORRECT
INCORRECT
5. Check the valve
timing
CORRECT
INCORRECT
7. Check the valve
springs
*
GOOD
WEAR
8. Remove and
inspect the cam
lobe height
*
CORRECT
WORN
• Faulty fuel pump unit
*
• Clogged fuel pump filter
(P.44)
4. Check the fuel
pump operation
and inspect the
fuel flow
*
CORRECT
INCORRECT
POOR HANDLING
Steering is heavy
• Steering stem adjusting nut too tight*
• Damaged steering head bearings
• Faulty HPSD*
Either wheel is wobbling
• Excessive wheel bearing play
• Bent rim
• Improperly installed wheel hub
• Excessively worn swingarm pivot bearings
• Bent frame
The motorcycle pulls to one side
• Front and rear wheels not aligned
• Bent fork
• Bent swingarm
• Bent axle shaft
• Bent frame
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