What is the correct spark plug and gap for my engine?
Due to the variety of engine and equipment configurations, your best source for spark plug information is your engine or equipment Operator’s Manual. However, the following general guidelines will get you pointed in the right direction. This guide provides the common spark plug part numbers used in our L-Head and Overhead Valve engines. For information regarding the service/replacement of spark plugs, please visit our Servicing the spark plug FAQ. Please be aware that the size/shape of the spark plug varies depending on engine design.