Honda NSS250S Manual page 711

TROUBLESHOOTING
7. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing within specification?
YES
NO
8. Cylinder compression Inspection
Test the cylinder compression.
Is the compression within specification?
YES
NO
9. PGM-FI System Inspection
Check the PGM-FI system (page 6-14).
Is the PGM-FI system normal?
YES
NO
10. lubrication Inspection
Remove the cylinder head cover and inspect for sings of proper lubrication.
Is the valve train lubricated properly?
YES
NO
11. Overheating Inspection
Check for engine overheating.
Is the engine overheating?
YES
NO
12. Engine Knocking Inspection
Accelerate or run at high speed.
Is the engine knocking?
YES
NO
26-4
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– GO TO STEP 8.
– • Faulty PCM/ECM
• Faulty CKP sensor
• Improper valve timing
– GO TO STEP 9.
– • Valve clearance too small
• Worn cylinder and piston rings
• Improper valve timing
• Damaged cylinder head gasket
– GO TO STEP 10.
– Faulty PGM-FI system (page 6-19)
– GO TO STEP 11.
– Clogged oil passage
– • Coolant level too low
• Faulty radiator fan
• Thermostat stuck closed
• Excessive carbon build-up in combustion chamber
• Use of poor quality fuel.
• Clutch slipping
• Lean fuel mixture
– GO TO STEP 12.
– • Worn piston and cylinder
• Wrong type of fuel
• Excessive carbon build-up in combustion chamber
• Ignition timing too advanced (faulty PCM/ECM)
• Lean fuel mixture
– Engine does not knock.