What is the right spark plug & gap for my engine?

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Checking and changing spark plugs is an essential step in routine engine maintenance and when troubleshooting problems with your outdoor power equipment.

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

Find your spark plug type & gap

There are different types of spark plugs so be sure to use the correct one before replacing. You can see the different types shown to the left.

 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.

Where is the spark plug located on 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.

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.

Spark plug location: Horizontal Engines

Spark Plug Horizontal Shaft Engines Single Cylinder
Spark Plug Horizontal Shaft Engines V-Twin
Spark Plug Horizontal Shaft Engines V-Twin

Spark plug location: Vertical Engines

Spark Plug Vertical Shaft Engines V-Twin
Spark Plug Vertical Shaft Engines V-Twin
Spark Plug Vertical Shaft Engines V-Twin


Download the operator's manual for your Vanguard engine or equipment by following our step-by-step process.


Take advantage of the expertise your local dealer can provide for service and support on your Vanguard engine.

Please read and abide by any applicable Safety Information contained in your engine Operator's Manual. The material provided above is not intended to replace work performed by a Briggs & Stratton authorized dealerTerms and Conditions apply to all of the information presented on this website. Always be sure to completely read and understand your engine Operator's Manual.