Honda CRF450R 2009 Service Manual page 552

TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
19·6
1. Fuel Pump Inspection
Inspect the fuel flow.
Is the fuel pump unit normal?
YES - GO TO STEP 2.
NO - Faulty fuel pump unit
2. PGM-FI Syst em Inspection
Check the PGM-FI system.
Is th e PGM-FI system normal?
YES - GO TO STEP 3.
NO - Faulty PGM-FI system
3.
Ignition Timing Ins pection
Check ignition timing.
Is the ignition timing correc t ?
NO - ' Faulty ECM
• Faulty CKP sensor(s)
YES - GO TO STEP 4.
4. Valve Timing Inspection
Check valve timing.
Is the valve timing correct?
NO - Camshaft not installed properly
YES - GO TO STEP 5.
5. Camshaft Inspection
Remove and inspect the camshaft
Is the cam lobe height within specification ?
YES - Faulty camshaft