Honda NSS250S Manual page 713

TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1. Ignition Timing Inspection
Check the ignition timing.
Is the ignition timing within specification?
YES
NO
2. Fuel Line Inspection
Disconnect the fuel hose at the fuel pump.
Does the fuel flow freely?
YES
NO
3. PGM-FI System Inspection
Check the PGM-FI system (page 6-14).
Is the PGM-FI system normal?
YES
NO
4. Spark Plug Inspection
Remove and inspect the spark plug.
Is the spark plug in good condition?
YES
NO
5. Valve Timing Inspection
Check the valve timing.
Is the valve timing correct?
YES
NO
6. Valve Spring Inspection
Check the valve springs.
Is the valve spring free length within specification?
YES
NO
7. Camshaft Inspection
Remove and inspect the camshaft.
Is the cam lobe height within specification?
YES
NO
26-6
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– GO TO STEP 2.
– • Faulty PCM/ECM
• Faulty CKP sensor
• Improper valve timing
– GO TO STEP 3.
– • Clogged fuel line
• Faulty fuel pump
• Loose or disconnected fuel pump system line
– GO TO STEP 4.
– Faulty PGM-FI system (page 6-19)
– GO TO STEP 5.
– • Plug not serviced frequently enough.
• Incorrect spark plug heat range
• Incorrect spark plug gap
• Dirty air cleaner element
– GO TO STEP 6.
– Cam sprocket not installed properly.
– GO TO STEP 7.
– Faulty valve spring
– Camshaft is OK.
– Faulty camshaft