Honda CRF450R 2011 Owner's Manual page 159

Troubleshooting
POOR PERFORMANCE AT LOW AND IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check the spark INCORRECT • Incorrect spark plug heat
plug condition range
(P.71) • Incorrect spark plug gap
• Plug not serviced
CORRECT
frequently enough
2. Check the ignition INCORRECT • Faulty ECM*
timing* • Faulty CKP sensor*
CORRECT
INCORRECT
3. Check the PGM-FI • Faulty PGM-FI system
system (P.11) (P.13)
CORRECT
INCORRECT
4. Check the fuel • Faulty fuel pump unit*
pump operation • Clogged fuel pump filter
and inspect the fuel (P.48)
flow*
CORRECT
5. Check the insulator INCORRECT • Loose insulator
for leaks • Damaged insulator
CORRECT
WEAK OR
6. Try spark test* • Faulty, carbon or wet
INTERMITTENT fouled spark plug (P.71)
SPARK • 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*
150
Tips
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Check the ignition INCORRECT • Faulty ECM*
timing* • Faulty CKP sensor*
CORRECT
2. Remove the air DIRTY • Not cleaned frequently
cleaner (P.60) enough
AIR CLEANER
NOT DIRTY
INCORRECT
3. Check the PGM-FI • Faulty PGM-FI system
system (P.11) (P.13)
CORRECT
4. Check the fuel INCORRECT • Faulty fuel pump unit*
pump operation and • Clogged fuel pump filter
inspect the fuel flow* (P.48)
CORRECT
5. Check the valve INCORRECT • Camshaft not installed
timing properly (P.77)
CORRECT
6. Try spark test* WEAK OR • Faulty, carbon or wet
INTERMITTENT fouled spark plug (P.71)
GOOD SPARK
SPARK • 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*
7. Check the valve WEAR • Faulty valve springs*
springs*
GOOD
8. Remove the WORN • Faulty camshaft*
camshaft and
inspect the cam
lobe height*
CORRECT
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