Honda 2003 NPS50 Ruckus Service Manual page 54

Check the insulator for cracks or damage, and the
electrodes for wear, fouling o r discoloration.
Replace the plug if necessary.
If the electrode is contaminated with carbon depos­
its, clean the electrode using a spark plug cleaner.
Replace the plug if necessary.
Always use the specified spark plug on this scooter.
SPECIFIED SPARK PLUG ('03 - '05 model):
Standard:
CRBEH-9 (NGK), U24FER9 (DENSO)
For cold climate (below 5'C/41 'F):
CR7EH-9 (NGK), U22FER9 (DENSO)
For extended high speed riding:
CR9EH-9 (NGK). U27FER9 (DENSO)
SPECIFIED SPARK PLUG (After '05 model):
Standard:
CRBEH-9 (NGK)
For cold climate (below 5'C/41 'F):
CR7EH-9 (NGK)
For extended high speed riding:
CR9EH-9 (NGK)
Measure the spark plug gap between the center and
side electrodes with a feeler gauge.
If necessary, adjust the gap by bending the side
electrode carefully.
SPARK PLUG GAP: 0.80 - 0.90 mm (0.031 - 0.035 in)
Install the spark plug to the cylinder head and hand
tighten, then torque to specification.
TORQUE: 12 N·m (1.2 kgf·m, 9 lbf·ft)
Install the spark plug cap.
MAINTENANCE
CENTER ELECTRODE
INSU
SIDE ELECTRODE
0.80 - 0.90 mm (0.031 - 0.035 in)
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