Spark Plug Inspection - Except L15A1 (IN model), L15A5, and L15A6

Except L15A5 engine

1.Inspect the electrodes and ceramic insulator.

  • Burned or worn electrodes may be caused by:
    • Advanced ignition timing
    • Loose spark plug
    • Plug heat range too hot
    • Insufficient cooling

  • Fouled plug may be caused by:
    • 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.Check the electrode gap (A). If the gap is over the standard, adjust the gap with suitable gapping tool.

Electrode Gap 
Standard (New): 1.0-1.1 mm (0.039-0.043 in.) 


3.Replace the plug at the specified interval, or if the center electrode is rounded (A). Use only the spark plugs as listed.

Spark Plugs 
L13A5 (KY model) and L15A4 (IN model) engines: 
NGK: BKR5E-11 
Except L13A5 (KY model) and L15A4 (IN model) engines: 
NGK: BKR6E-11 


4.Apply a small quantity of anti-seize compound to the plug threads, and screw the plugs into the cylinder head finger-tight. Then torque them to 18 N·m (1.8 kgf·m, 13 lbf·ft).