Spark Plug Fouls Repeatedly

1. Incorrect spark plug for the kind of service.

2. Piston rings badly worn or broken.

3. Fuel mixture too rich (see carburetor trouble chart).

4. Valve guides badly worn.

PRE-IGNITION OR DETONATION (Knocks or Pings)

1. Excessive carbon deposit on piston head or in combustion chamber.

2. Incorrect spark plug for the kind of service.

3. Defective spark plugs.

4. Ignition timing advanced.

5. Fuel octane rating too low.

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