Spark Plug Removal And Inspection

Courtesy of HONDA, U.S.A., INC.

1. Inspect the electrodes and the ceramic insulator.

• Burned or worn electrodes may be caused by these conditions:
• • Advanced ignition timing
  • Loose spark plug
  • Plug heat range too hot
  • Insufficient cooling
• Fouled plugs may be caused by these conditions:
• • Retarded ignition timing
  • Oil in combustion chamber
  • Incorrect spark plug gap
  • Plug heat range too cold
  • Excessive idling/low speed running
  • Clogged air cleaner element
  • Deteriorated ignition coils

2. If the spark plug electrodes are dirty or contaminated, clean the electrodes with a plug cleaner.

NOTE: 

• Do not use a wire brush or scrape the iridium electrode since this will damage the electrode.
• When using a sand blaster spark plug cleaner, do not clean for more than 20 seconds to avoid damaging the electrode.

Courtesy of HONDA, U.S.A., INC.

3. Replace the plug at the specified interval, or if the center electrodes (A) is rounded, or if the spark plug gap (B) is out of specification, or if the spark plug electrode is dirty or contaminated. Use only the spark plugs listed.NOTE:  Do not adjust the gap of iridium tip plugs.