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How to Change the Spark Plug on a Lawn Tractor

How to Change the Spark Plug on a Lawn Tractor

Spark plugs should be replaced at least once a year of after 100 hours of use. Spark plugs provide an ignition source for your machine’s engine to power your lawn tractor. When spark plugs go bad, mowing your lawn becomes a challenge. For example, faulty spark plugs make your tractor difficult to start or cause your engine to die out quickly. Change the spark plug on your lawn tractor regularly to keep your mower up and running throughout the whole season.

Before performing any maintenance on your lawn tractor, refer to your owner’s manual for maintenance instructions and safety information. Maintenance instructions vary by model, so depending on your lawn mower model our instructions may vary slightly.

Before changing the spark plug on your mower, please abide by these safety precautions:

  • Shut off the engine
  • Allow the engine to become cool to the touch
  • Disconnect the spark plug wire to prevent accidental starting

To carry out this task, you’ll need these tools:

  • 5/8 deep well socket
  • Wrench
  • Extension

To change the spark plug on your lawn tractor, locate the spark plug on the side of the engine. Some tractor models have single-cylinder engines (with one spark plug) while others have twin-cylinder engines (with 2 spark plugs). Use your socket to loosen the spark plug. Loosen it and grab the spark plug on the end, and give it a couple more turns.

Install the new spark plug. Replace the old spark plug with a manufacturer approved replacement part (refer to your owner’s manual). Hold the spark plug on the end and stick it into the proper hole on the tractor. Turn the spark plug to the left to make sure that it is starting to thread in properly, but turn it to the right to tighten it.

Tighten the spark plug by hand. By doing this, you can tell if the threads are going in correctly and won’t strip the threads out of the head of the engine. Tighten as much as you can and then put your socket back on the spark plug to tighten it all the way down. Give it an extra snug turn.

If you are working with a twin-cylinder engine, repeat the same steps to change the spark plug on the other side of the machine. Once the spark plugs have been changed, reconnect the spark plug wire.

You’ll notice your engine running less smoothly if it has a broken or fouled spark plug. To keep your lawn tractor running smoothly, replace the spark plug when the time is right. Feel free to bring your tractor to our experts and they will replace the spark plug in no time.

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Why Weingartz?

Weingartz, family owned and operated, began in 1945 as a farm supply store for local Michigan families. In the 1970s, we began to focus exclusively on outdoor power equipment. Over time, we morphed into the “power equipment superstore” that now defines all of our locations. The staff and experts at Weingartz work diligently to provide the best service possible and give honest and helpful advice to each and every customer.

Weingartz also sells parts for all outdoor power equipment at

11875 Northland Dr.
Cedar Springs, MI 49319
(616) 696-2913

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