What is the correct spark plug for my Briggs and Stratton small engine?
Founded in 1908, Briggs and Stratton has made 1,000’s of engines over their over 100 years. Due to this extremely large variety of Briggs and Stratton engines and equipment configurations, your best source for spark plug information is your engine or equipment operator’s manual.
If you no longer have your owner manual, most owners manuals are available online.
In the mean time, the following general guidelines will get you pointed in the right direction.
This guide provides the common spark plug part numbers used in Briggs and Stratton L-Head and Overhead Valve engines.
Please be aware that the size/shape of the spark plug varies depending on engine design.
Briggs & Stratton L-Head Engines
Use any of the following spark plugs gapped at .030″ in your Briggs and Stratton L-Head engines (also referred to as flat head or side valve engines):
Briggs and Stratton Part No. 697451 – Electromagnetic Suppression (EMS) Spark Plug
Briggs & Stratton Overhead Valve (OHV) Engines*
Use the appropriate spark plug gapped at .030″ in your Briggs and Stratton 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 (spark plug gap = .020″).
Briggs and Stratton Part No. 692051 – Resistor Spark plug
Briggs and Stratton Part No. 692720 – Electromagnetic Suppression (EMS) Spark plug
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. Including total destruction of your small engine. Think I’m kidding? We’ve seen it happen folks.
Having your piston slam into your spark plug will result in a very bad day.
Do you have questions or comments about Briggs and Stratton Spark Plugs? Feel free to contact us via phone, email or the comments section below.