What size spark plug in Briggs & Stratton engine should you use? Generally, a Briggs engine’s spark plug gap size for a standard resistor should be around .030”. However, the spark plug size may vary depending on the tool or vehicle.

The spark plug size in a chainsaw, blower, and mower has different spark plug sizes as they have different functions and architecture. So, the right size of spark is required so that you can use those tools properly. Today we will talk about the Briggs and Stratton spark plug chart.

Briggs and Stratton Spark Plug Chart: The Chart for the Correct Sizes

There are various sizes of spark plugs that work on specific engines. So, the correct size spark plug matters as it ensures a stable fuel economy, reliable starting, and consistent spark.

In the case of Briggs and Stratton, the spark plugs are categorized under their various models. Most of them are determined by the gap size, so you see the Briggs and Stratton spark plug gap.

Furthermore, we included our research and created a spark plug gap guide for a chainsaw, mower, and snow blower. Check them out.

All Machines Compatible Briggs and Stratton Spark Plug Chart

ConcernSpark Plug Hex SizeSpark Plug Reach
Briggs and Stratton Chainsaw20.6mm12.7mm
Briggs and Stratton  Riding Mower16mm19mm
Briggs and Stratton Snowblower20.6mm9.5mm

Briggs and Stratton Chainsaw Spark Plug Size

The Briggs and Stratton Chainsaw use champion spark plugs. Aside from the champion spark plug, platinum ones are used and are efficient. However, the NGK spark plug for Briggs and Stratton is also great for chainsaws. The thread size of the NGK series is usually 14mm, the standard size. Make sure the size is around 20.6mm, and the reach is 12.7 mm.

You might be wondering how to check the size. It’s pretty simple. Take the spark plug, and you will see a spark plug reference code there. In the case of Briggs and Stratton, you have to see the Briggs and Stratton spark plug cross reference chart. Then you can find out the actual size of the spark plug.

Moreover, you can check out Briggs and Stratton’s official site to find out the appropriate Briggs and Stratton spark plug thread size. Although the thread sizes are primarily standard, so you won’t have any complications with that. We recommend you not to use a different size spark plug. It will cause interference with the pistons causing damage to the engine.

Also Read: Briggs and Stratton Carburetor Troubleshooting Guide

So, what size spark plug does a Briggs and Stratton chainsaw use? In the case of hex size, it’s no more than 20.6mm. As for the heat range, it is 8. While the gap ranges around 0.30”, if the gap is more than that, be ready to face malfunctions.

Briggs and Stratton Riding Mower Spark Plug Size

The standard spark plug size for a riding mower is around 14-16mm. More than that, your mower won’t function properly. The Briggs and Stratton spark plug size for a mower is about 16mm.

NGK spark plug series are great for lawn mowers, but the champion series is comparatively better. However, the platinum spark plug is considered the best. During our research, the platinum series received the most praise in various forums.

The Briggs and Stratton spark plug application chart shows that the reach is 19mm. However, it can be 18 or 18.5. But more than that, it will begin to cause problems. For other engines, the size may differ as the hex sizes are also entirely different. But the thread size is 14mm.

Check out RCPW for any kind of after-market spark plugs. Make sure to go through the spark plug chart for Briggs and Stratton engines before purchasing any. Try to cross-reference between the reference code imprinted on the spark plug.

Briggs and Stratton Snowblower Spark Plug Size

Again, if you see the Briggs and Stratton spark plug cross reference chart, it’s almost similar to the chainsaw one. The only difference you will notice is the reach of the spark plug. It’s around 9.5mm, while FS is approximately 12.7mm for a chainsaw. The hex size is the same, which is about 20.6mm.

The center electrode should be a copper core. They ensure the best consistent sparks. The thread size is 14mm, like the other spark plugs we discussed. Also, the Champion Spark series is the best for a snow blower. While you can still use the platinum series, they are compatible with snow blower engines.

You mustn’t mismatch the spark plug size. Choosing the wrong one can have consequences, especially when it’s a snow blower. The engine will stop abruptly, causing damage to the entire blower. It will contain the ice cleaning process, which can be painful. Furthermore, it will create a mess.

A Helpful Tutorial You May Need!

Frequently Asked Questions (FAQs)

What spark plug do I need for my Briggs and Stratton?

For a Briggs and Stratton, go for the 496018S. It’s the standard spark plug for most Briggs and Stratton engines. But if it’s about the aftermarket spark plugs, you can choose NGK, Champion, Boss spark plugs. But you must ensure the spark plug gap and thread size.

What is the spark plug gap on a 5-horse Briggs & Stratton?

The spark plug gap for a 5-horse Briggs & Stratton is .030”. The gap size is standard for various components as well.

What types of spark plug do a Briggs and Stratton?

Most Briggs and Stratton engines use the 496018S as they are widely compatible. They have a gap of 0.30”.

What spark plug does a 17.5 Briggs and Stratton take?

The 17.5 Briggs and Stratton takes a 691043 OEM plug. It’s manufactured especially for the 17.5 models.


The correct spark plug size matters as your engine are dependent on the spark plug. The best spark plug ensures the best fuel economy and creates consistent sparks that keep the engine stable. If you are using Briggs & Stratton engine vehicle or tool, you need to get the compatible spark plug.

In the above, we included a Briggs and Stratton spark plug chart that will give you a better idea of what spark plug to choose in case your chainsaw, blower, or small engine machine has a faulty spark plug. Because an incompatible spark plug will damage the engines, make sure to follow the chart to get the right one.

By admin