Honda CRF450R 2009 Owner's Manual & Competition Handbook page 148

Troubleshooting
POOR PERFORMANCE AT LOW AND IDLE SPEED
CHECK
1. Check the spark INCORRECT
plug condition
(P.63)
CORRECT
2. Check the ignition INCORRECT
timing
*
CORRECT
3. Check the fuel INCORRECT
pump
*
CORRECT
4. Check the PGM-FI INCORRECT
system (P.7)
CORRECT
5. Check the insulator INCORRECT
for leaks
CORRECT
6. Try spark test WEAK OR
*
INTERMITTENT
SPARK
142
Tips
POOR PERFORMANCE AT HIGH SPEED
POSSIBLE CAUSES CHECK
• Incorrect spark plug
1. Check the ignition
heat range
timing
*
• Incorrect spark plug gap
CORRECT
• Plug not serviced
frequently enough
2. Remove the air
• Faulty ECM cleaner (P.52)
*
• Faulty CKP sensor
*
AIR CLEANER
NOT DIRTY
• Faulty fuel pump unit 3. Check the fuel
*
pump
*
CORRECT
• Faulty PGM-FI system
4. Check the PGM-FI
(P.9)
system (P.7)
CORRECT
• Loose insulator 5. Check the valve
• Damaged insulator timing
CORRECT
6. Try spark test
• Faulty, carbon or wet
fouled spark pulg (P .63)
GOOD 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
springs *
GOOD
8. Remove and
inspect the cam
lobe height
*
CORRECT
POSSIBLE CAUSES
• Faulty ECM
INCORRECT *
• Faulty CKP sensor
DIRTY • Not cleaned frequently
enough
INCORRECT • Faulty fuel pump unit
• Faulty PGM-FI system
INCORRECT
(P.9)
INCORRECT • Camshaft not installed
properly (P.69)
WEAK OR
* • Faulty, carbon or wet
INTERMITTENT fouled spark pulg (P .63)
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
WEAR • Faulty valve springs
WORN • Faulty camshaft
POOR HANDLING
Steering is heavy
• Steering stem adjusting nut too tight*
*
• Damaged steering head bearings
• Faulty HPSD*
Either wheel is wobbing
• 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
*
*
*
*
*
*
*