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Identifying the correct spark plug and gap
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.
Briggs & Stratton L-Head Engines
(also referred to as Flat Head or Side Valve Engines)
Use any of the following spark plugs gapped at .030" in our L-Head engines:
Briggs & Stratton Overhead Valve (OHV) Engines *
Use the appropriate spark plug gapped at .030" in our Overhead Valve engines:
∆ Used on Vanguard models 050032 and 086400 only.
*Except Intek single-cylinder vertical shaft engines and 825, 850, and 875 Series vertical shaft. For these engines, use the spark plug's listed below (sparkplug gap - .020").
CAUTION! Be sure to use the right spark plug! Although several different spark plug's may screw into the engine, using the incorrect one will result in performance problems and possible internal engine damage.
NOTE: Please read and abide by any applicable Safety Information (PDF) before performing any engine work. This information is not meant to take the place of work performed by a Briggs & Stratton Authorized Dealer. Terms and Conditions apply to all of our information provided on this website. Always be sure to read and understand your engine Operator's Manual.
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