Honda NSS250S Manual page 712

POOR PERFORMANCE AT LOW AND IDLE SPEED
1. Spark Plug Inspection
Remove and inspect the spark plug.
Is the spark plug in good condition?
YES
NO
2. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing within specification?
YES
NO
3. PGM-FI System Inspection
Check the PGM-FI system (page 6-14).
Is the PGM-FI system normal?
YES
NO
4. Intake Pipe Leaking Inspection
Check for leaks at the intake manifold boot.
Does it leak?
YES
NO
5. Spark Test
Perform spark test.
Is the spark good?
YES
NO
maxiscooter-club.ru
– GO TO STEP 2.
– • Plug not serviced frequently enough
• Incorrect spark plug heat range
• Incorrect spark plug gap
– GO TO STEP 3.
– • Faulty PCM/ECM
• Faulty CKP sensor
• Improper valve timing
– GO TO STEP 4.
– Faulty PGM-FI system (page 6-19)
– • Loose intake manifold mounting bolt
• Damaged insulator
• Damaged O-ring
– GO TO STEP 5.
– • Faulty IACV
• Improperly adjusted valve clearance
– • Faulty spark plug
• Faulty carbon or wet fouled spark plug
• Faulty PCM/ECM
• Faulty ignition coil
• Broken or shorted spark plug wire
• Faulty engine stop switch
• Faulty engine stop relay
• Faulty CKP sensor
• Faulty ignition switch
• Loose or disconnected ignition system wires
TROUBLESHOOTING
26-5