Honda CRF250R 2018 Owner's Manual page 153

Troubleshooting
POOR PERFORMANCE AT LOW AND IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check the spark INCORRECT • Incorrect spark plug heat
plug condition range
(P.67) • Incorrect spark plug gap
• Plug not serviced
CORRECT
frequently enough
INCORRECT
2. Check the ignition • Faulty ECM*
timing* • Faulty CKP sensor*
CORRECT
INCORRECT
3. Check the PGM-FI • Faulty PGM-FI system
system (P.7) (P.9)
CORRECT
INCORRECT
4. Check the fuel • Faulty fuel pump unit*
pump operation • Clogged fuel pump filter
and inspect the fuel (P.45)
flow*
CORRECT
INCORRECT
5. Check the insulator • Loose insulator
for leaks • Damaged insulator
CORRECT
INCORRECT
6. Check the valve • Faulty valve clearance
clearance (P.68) • Faulty valve*
• Faulty valve seat*
CORRECT
• Faulty camshaft(s)*
• Faulty rocker arm(s)*
WEAK OR
7. Try spark test* • Faulty, carbon or wet
INTERMITTENT
fouled spark plug (P.67)
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 battery
148
Tips
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Check the ignition INCORRECT • Faulty ECM*
timing* • Faulty CKP sensor*
CORRECT
2. Check the air DIRTY • Not cleaned frequently
cleaner (P.56) enough
AIR CLEANER
NOT DIRTY
3. Check the PGM-FI INCORRECT • Faulty PGM-FI system
system (P.7) (P.9)
CORRECT
4. Check the fuel pump INCORRECT • Faulty fuel pump unit*
operation and • Clogged fuel pump filter
inspect the fuel flow* (P.45)
CORRECT
5. Check the valve INCORRECT • Camshaft not installed
timing properly (P.73)
CORRECT
6. Check the valve INCORRECT • Faulty valve clearance
clearance (P.68) • Faulty valve*
• Faulty valve seat*
CORRECT
• Faulty camshaft*
• Faulty rocker arm(s)*
7. Check the valve WEAR • Faulty valve springs*
springs*
GOOD
8. Try spark test* WEAK OR • Faulty, carbon or wet
INTERMITTENT fouled spark plug (P.67)
GOOD SPARK
• Faulty ECM*
SPARK
• 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 WORN • Faulty camshaft*
inspect the cam
lobe height*
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