Spark Plug Inspection: Test

How to use this manual .

1. Spark Plug - Inspect

   Preconditions 

   • Spark Plug Removed

   Procedure/Specifications 

   NOTICE:  

   • Do not adjust the gap or clean the spark plug with a wire brush since this will damage the electrode.
   • Replace the spark plug when prompted by the maintenance minder or according to the maintenance schedule.
   • If an abnormality is suspected, replace the suspected spark plug from another cylinder and recheck.

   Specifications 

   Standard Value (New)
   a	1.0-1.1 mm (0.039-0.043 in)

   Specifications 

   Position	Item	Specification
   b	Worn or deformed electrodes Improper gap Oil-fouling Carbon deposits Cracked center electrode insulator	Inspection items is normal
   c	Damaged gasket
   d	Cracked insulator

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

   • 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

   Result 

   • If it is abnormal, replace the spark plug.