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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
Fig 1: Inspecting Electrodes & Ceramic Insulator
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Do not adjust the gap (A) of platinum tip plugs; replace the spark plug if the gap is out of specification.
Electrode Gap

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

Service Limit: 1.3 mm (0.051 in.)

Fig 2: Adjusting Spark Plug Gap
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Replace the plug at the specified interval or if the center electrode is rounded (A). Use only the spark plugs listed.
Spark Plugs

NGK: PZFR5F-11

DENSO: PKJ16CR-L11

Fig 3: Inspecting Spark Plug Center Electrode
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.)

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Spark Plug Inspection