Spark Plug: Service Precautions

SERVICE PRECAUTIONS:
^ Allow the engine to cool before removing the spark plugs. Attempting to remove the plugs from a hot engine may cause the plug to seize, causing damage to the cylinder head threads.

^ Clean the spark plug recess area before removing the plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head or contamination of the cylinder head threads. Contaminated threads may prevent proper seating of a new plug.

^ Do not install plugs that are either "hotter" or "colder" than the heat range specified. Using plugs of the wrong heat range can severely damage the engine.