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168 Tips
Troubleshooting
POOR HANDLING
Steering is heavy
• Steering stem adjusting nut too tight*
• Damaged steering head bearings
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
POOR PERFORMANCE AT LOW AND IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check the spark
plug condition
(P.81)
• Incorrect spark plug heat
range
• Incorrect spark plug gap
• Plug not serviced
frequently enough
2. Check the ignition
timing*
• Faulty ECM*
• Faulty CKP sensor*
3. Check the PGM-FI
system (P.7)
• Faulty PGM-FI system
(P.9)
4. Check the fuel
pump operation
and inspect the fuel
flow*
• Faulty fuel pump unit*
• Clogged fuel pump filter
(P.48, 58)
5. Check the insulator
for leaks
• Loose insulator
• Damaged insulator
6. Check the valve
clearance (P.82)
• Faulty valve clearance
• Faulty valve*
• Faulty valve seat*
• Faulty camshaft(s)*
• Faulty rocker arm(s)*
7. Try spark test* • Faulty, carbon or wet
fouled spark plug (P.81)
• 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 battery
CORRECT
INCORRECT
CORRECT
INCORRECT
CORRECT
INCORRECT
CORRECT
INCORRECT
CORRECT
INCORRECT
CORRECT
INCORRECT
WEAK OR
INTERMITTENT
SPARK
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Check the ignition
timing*
• Faulty ECM*
• Faulty CKP sensor*
2. Check the air
cleaner (P.70)
• Not cleaned frequently
enough
3. Check the PGM-FI
system (P.7)
• Faulty PGM-FI system
(P.9)
4. Check the fuel pump
operation and
inspect the fuel flow*
• Faulty fuel pump unit*
• Clogged fuel pump filter
(P.48, 58)
5. Check the valve
timing
• Camshaft not installed
properly (P.87)
6. Check the valve
clearance (P.82)
• Faulty valve clearance
• Faulty valve*
• Faulty valve seat*
• Faulty camshaft*
• Faulty rocker arm(s)*
7. Check the valve
springs*
• Faulty valve springs*
8. Try spark test* • Faulty, carbon or wet
fouled spark plug (P.81)
• 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*
9. Remove and
inspect the cam
lobe height*
• Faulty camshaft*
CORRECT
INCORRECT
AIR CLEANER
NOT DIRTY
DIRTY
CORRECT
INCORRECT
CORRECT
INCORRECT
CORRECT
INCORRECT
CORRECT
INCORRECT
GOOD
WEAR
GOOD SPARK
WEAK OR
INTERMITTENT
SPARK
WORN
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