148 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.67)
• 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.45)
5. Check the insulator
for leaks
• Loose insulator
• Damaged insulator
6. Check the valve
clearance (P.68)
• 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.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 battery
CORRECT
CORRECT
CORRECT
CORRECT
CORRECT
CORRECT
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.56)
• 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.45)
5. Check the valve
timing
• Camshaft not installed
properly (P.73)
6. Check the valve
clearance (P.68)
• 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.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*
9. Remove and
inspect the cam
lobe height*
• Faulty camshaft*
CORRECT
CORRECT
CORRECT
CORRECT
CORRECT
GOOD
GOOD SPARK
WEAK OR
INTERMITTENT
SPARK
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