Checking and changing spark plugs is an essential step in routine small engine maintenance and when troubleshooting problems with your lawn mower, snow blower or other outdoor power equipment.

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Before doing any small engine repair or maintenance, be sure to check your manual for recommendations on specific parts numbers and safety precautions.

Now that you’ve found the part you’d like to replace, you can use the chart below to identify the genuine Briggs & Strattonreplacement spark plugand gap recommendation.

CAUTION!Be sure to use the right spark plug. Although several different spark plugs may screw into the engine, using the incorrect one will result in performance problems and possible internal engine damage.


Also known as L-head or side valve engines, these engines are commonly used for walk behind lawn mowers and pressure washers.


*Not for Quantum engines built before Date Code 110701xx or other L Head engines

.020”"Surefire" RJ2YXLE in Craftsman Smooth Start (MRS) lawn mower591040.030”

WARNING: Always read theengine and equipment manual(s) before starting, operating, or servicing your engine or equipment to avoid personal injury or property damage. See anauthorized dealerif you are unsure of any procedure or have additional questions.Find all Engine Safety Warnings >





Learn how to properly and safely use, troubleshoot and maintain your Briggs & Stratton equipment.

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