What is the correct spark plug for my Briggs and Stratton small engine

August 4, 2016March 24, 2017 Jack Hayes

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. 802592S or Part No. Briggs and Stratton Part No. 5095 – Standard Resistor Spark plug

Briggs and Stratton Part No. 697451 – Electromagnetic Suppression (EMS) Spark Plug

Briggs and Stratton Part No. 5062 (spark plug may have production number 499730 printed on porcelain) – Platinum Spark plug.
(These spark plugs replace Champion CJ8, RCJ8, J19LM, and RJ19LM)

Briggs & Stratton Overhead Valve (OHV) Engines*

Use the appropriate spark plug gapped at .030″ in your Briggs and Stratton Overhead Valve engines:

Briggs and Stratton Part No. 711252 – Resistor Spark plug∆ (Replaces Champion RC12YC)

Briggs and Stratton Part No. 491055S – Resistor Spark plug (Replaces Champion RC12YC)

Briggs and Stratton Part No. 691043 – Electromagnetic Suppression (EMS) Spark plug (Replaces Champion QC12YC)

Briggs and Stratton Part No. 5066 (spark plug may have production number 694385 printed on porcelain) – Platinum Spark plug (Replace Champion RC12YC).

Briggs and Stratton Part No. 496018S or Briggs and Stratton Part No. 5092 – Resistor Spark plug (hotter spark) (Replaces Champion RC14YC)

∆ 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.