Spark Plug Inspection: Inspection

Spark Plug - Inspection
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
      
      Fig 1: Identifying Spark Plug Inspection Areas
      Courtesy of AMERICAN HONDA MOTOR CO., INC.
2. Replace the plug at the specified interval, or if the center electrode (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.
  - Do not use a plug cleaner.
  Spark Plugs
  
  NGK: ILZKR7B-11S
  
  DENSO: SXU22HCR11S
  
  Electrode Gap
  
  Standard (New): 1.0-1.1 mm (0.039-0.043 in)
  
  Fig 2: Identifying Spark Plug Gap
  Courtesy of AMERICAN HONDA MOTOR CO., INC.