Honda CBR125R, Owner'S Manual

Page: 424 / 430

TROUBLESHOOTING
21-4
7. Ignition Timing Inspection
Check ignition timing.
Is the ignition timing correct?
NO – • Faulty ECM
• Faulty CKP sensor
YES – GO TO STEP 8.
8. Cylinder compression Inspection
Test the cylinder compression.
Is the compression as specified?
NO – • Improper valve clearance
• Valve stuck open
• Worn cylinder and piston rings
• Damaged cylinder head gasket
• Improper valve timing
YES – GO TO STEP 9.
9. Fuel Pump Inspection
Inspect the fuel flow.
Is the fuel pump unit normal?
NO – Faulty fuel pump unit
YES – GO TO STEP 10.
10. PGM-FI system Inspection
Check the PGM-FI system.
Is the PGM-FI system normal?
NO – Faulty PGM-FI system
YES – GO TO STEP 11.
11. Lubrication Inspection
Remove cylinder head cover and inspect lubrication.
Is the valve train lubricated properly?
NO – • Clogged oil passage
• Faulty oil pump
• Oil strainer screen not serviced frequently enough
YES – GO TO STEP 12.
12. Over Heating Inspection
Check for engine over heating.
Is the engine over heating?
YES – • Excessive carbon build-up in combustion chamber
• Use of poor quality fuel
• Wrong type of fuel.
• Clutch slipping
NO – GO TO STEP 13.
13. Engine Knocking Inspection
Accelerate or run at high speed.
Is there knocking?
YES – • Worn piston and cylinder
• Wrong type of fuel
• Excessive carbon build-up in combustion chamber
• Ignition timing too advance (Faulty ECM or CKP sensor)
NO – Engine does not knock.