Honda CRF450R 2009 Service Manual page 550

TROUBLESHOOTING
19-4
6. Ignition Timing Inspection
Check ignition timing.
Is the Ignition timing correct?
NO Faulty ECM
Faulty CKP sensor(s)
YES '09: GO TO STEP 7.
After '09: GO TO STEP 8.
7. Gear Position Switch Inspection ('09)
Check gear position switch.
Is the gear position switch normal?
NO - Faulty gear position switch
YES - GO TO STEP
8.
8. Cylinder compression Inspection
Test the cylinder compression.
Is the compression low?
YES - Valve clearance too small
Valve stuck open
Worn cylinder and piston rings
Damaged head gasket
Improper valve timing
Faulty decompressor system
NO - GO TO STEP 9.
9. Fuel pump Inspection
Inspect the fuel flow.
Is the fuel pump unit normal?
YES - GO TO STEP 10.
NO - Faulty fuel pump unit
10.
PGM·Fl System Inspection
Check the PGM·FI system.
Is the PGM·FI System normal?
YES -GOTOSTEP11 .
NO - Faulty PGM·FI system
11. Spark Plug Inspection
Remove and inspect spark plug.
Is the spark plug fouled or discolored?
YES _ . Spark plug not serviced frequenlly enough
• Incorrect spark plug used
NO - GO TO STEP 12.
12. Engine Oil Inspection
Check engine oil level and condition.
Is
there correct level and good condition?
NO Engine oil level too high
• Engine oil level too low
• Contaminated engine oil
YES - GO TO STEP 13.