How to Clean a Lawn Mower Spark Plug

How to Clean a Lawn Mower Spark Plug Complete Guide

Understanding how to clean a lawnmower spark plug is crucial for maintaining optimal engine performance. A spark plug plays a pivotal role in the ignition process, facilitating the transfer of electric current to the combustion chamber to ignite fuel.

The spark plug is inside a metal thread shell, and the spark plug’s electrode is linked to a coil that generates electricity. This integral component, situated within the engine, is responsible for supplying the necessary current for combustion.

Neglecting the maintenance of a spark plug can result in various issues, including challenging starts and engine inefficiencies.

In this comprehensive guide, I will provide you with the significance of spark plug upkeep and provide step-by-step instructions on how to effectively clean it, ensuring your lawnmower operates smoothly.

By understanding the importance of spark plug maintenance and learning the proper cleaning techniques, you can ensure optimal engine functionality and prolong the life of your lawnmower.

Signs of Defective Spark Plug?

To sort out the defective spark plug you have to visually inspect the spark plug by removing it from the combustion chamber. However, there are a few signs which tell about defective spark plugs these signs are:

  • The first sign of your defective spark plug is that your lawnmower engine does not start or start after igniting several times.
  • When you run the engine and it’s missing sometimes it loses power on and off which means your spark plug might be defective and not provide the current consistently.

These are the two major signs of a defective spark plug in your lawnmower. To address the issue you need to clean your spark plug or replace it with the new one.

Cleaning of Spark Plug

After diagnosing of defective spark plug now you need to clean it. For this purpose, you might remove the spark plug and clean it or you also clean it without removing its depend on your choice.

Cleaning of Spark Plug by Removing Them

If you want to clean the spark plug it is recommended to remove it from the combustion chamber where it is fitted. To locate the spark plug you may read the instruction manual of your lawnmower. The step for cleaning the lawnmower spark plug by removing it is as follows:


To clean the spark plug you need to remove the wire from the spark plug after this now you can lose the thread by using the appropriate socket spanner and remove it carefully from the engine/spark plug socket. After removing cover the engine opening with tissue or cloth so that dust doesn’t go inside the engine.


Now you inspect the spark plug from both sides, you can notice that both ends of your spark plug are filled with black carbon, rust, and dirt, sometimes you see oil on the spark plug and it is soiled therefore now your start cleaning the spark plug.


You can clean both ends of the spark plug by using the wire brush thoroughly or you also use sandpaper for this purpose.


After cleaning now you need to clean it deeply for this purpose you need vinegar or WD-40 contact cleaner. Spray on both ends of the spark plug and clean it using a wire brush. These liquids will clean it deeply and remove all the debris of carbon, rust, dirt, and oil from the spark plug.


After cleaning it now you adjust the electrode gap by reading the user manual of your lawn mower.


Now install back the spark plug in your lawn mower engine. Tight it by using the appropriate socket spanner. Be careful while tightening. Do not tighten too much or be left loose because it will create problems.


Now start the engine and check the working of your lawnmower, if you feel power loss again or it does not ignite the engine in the first run then you need to replace the spark plug.

Cleaning Lawn Mower Spark Plug Without Removing

If you don’t want to remove the spark plug and you want to clean it from the outside. The idea is not much effective because the spark plug is cleaned from one end and you need to clean it from both sides. However, you can do this by using by following below mention steps:


Remove the electric wire/plug from the spark plug.


Now visually inspect the spark plug.


Now clean the spark plug by using a wire brush or sandpaper from the outside terminal.


Use WD-40 or any other cleaning lubricants and clean it thoroughly.


After cleaning install the electric plug again and start the engine.


You also used compressed air to clean it if this option is available at your home.

Note: This is not the recommended way to clean the spark plug because it does not clean thoroughly from the electrode side and it might not work. However, if you are living in villages and small towns where the level of dust and environmental pollution is very low then this method work for you because the connecting point which passes the electricity is cleaned and your mower starts working again.


While addressing the spark plug issues, you need to replace the faulty and deteriorated spark plug to mow accurately, and your lawnmower starts working perfectly. For this purpose, I will guide you step by step on how to change the spark plug in your lawnmower accurately without any issues at your home quickly.


Be careful while changing the spark plug in your lawnmower, and follow these golden safety tips:

A. Do not change the spark plug if you recently Turn OFF your lawnmower because hot surfaces may burn your hands if you are not using the proper gloves.

B. Do not do the work in a hurry because it will lead to damage to your expensive lawn mower.

C. Always use the appropriate tool because the wrong tool is dangerous for both the lawnmower and the operator. It may injure you or may damage the faulty spark plug inside the housing, which creates big trouble for you.


You need to choose the clear deck so that you may not face any issues while doing maintenance work. Additionally, you need the recommended tool to avoid any inconvenience during the changing of the spark plug. The essential tools are:

  • Spark Plug Socket
  • Adjustable Wrench
  • Spark Plug Gap Gauge
  • Safety Gloves


In the very next step, you need to gain access to the lawnmower spark plug by removing the other parts like in a few lawnmowers, and you need to remove the air filter to access the spark plug. It depends upon the company design, and spark plug origin may vary according to the company.


After accessing the spark plug now, you need to remove it from the lawnmower. Now remove the spark plug by using the spark plug socket.


After removing the faulty plug now, you measure the gap between the electrodes of your new spark plug using the gauge. The gap should be adjusted carefully according to the manufacturer’s recommendation. The manufacturer of your lawnmower clearly mentioned the electrode gap in your mower’s instruction manual.


Now install the new spark plug and collect all the tools POWER ON the lawn mower, and hence your mower is ready to mow your lawn.


What is a spark plug and why is it important?

A spark plug is a mandatory component of the engine’s ignition system. It ignites the air-fuel mixture in the combustion chamber, powering the engine. Properly functioning spark plugs are vital for efficient engine performance.

How do I know if my lawn mower spark plug needs cleaning or replacing?

Signs of a problematic spark plug include difficulty starting the engine, rough idling, and decreased power and fuel efficiency. If you notice any of these issues, it may be time to clean or replace the spark plug.

When should I clean my lawn mower spark plug?

It’s recommended to clean your spark plug at least once a season or every 25 hours of use. If you notice signs of fouling or damage, clean the spark plug immediately to prevent further issues.

What tools do I need to clean a lawn mower spark plug?

o clean a spark plug, you’ll typically need a socket wrench, spark plug cleaner, and a wire brush. These tools will help you remove and clean any deposits on the spark plug.

How do I clean a lawn mower spark plug?

First, disconnect the spark plug lead and then use a socket wrench to unscrew the spark plug. Next, use a spark plug cleaner or a wire brush to remove any deposits around the spark plug. Ensure the plug is in good condition before reinstalling it.

Can I reuse a cleaned spark plug?

If the spark plug is in good condition after cleaning and the electrodes are not worn out, you can reuse it. However, if the plug shows signs of damage or wear, it’s best to replace it with a new one.

What are the consequences of not maintaining the lawn mower’s spark plug?

Neglecting spark plug maintenance can lead to poor engine performance, increased fuel consumption, and potential engine damage. It’s essential to keep the spark plug in working order for optimal lawn mower performance.

How do I troubleshoot stubborn deposits on the spark plug?

For stubborn deposits, you can use a spark plug cleaner or carefully clean the tip of the spark plug by hand. If the deposits are too severe, replacing the spark plug may be necessary.

How can I ensure my lawn mower’s spark plug is in good condition?

Regularly inspect the spark plug for any signs of damage, such as cracked porcelain or excessive deposits. Additionally, check the gap and clean the plug as needed to ensure it can produce an adequate spark for ignition.

Are there any specific tips for maintaining a lawn mower spark plug?

When cleaning or replacing the spark plug, always disconnect the spark plug lead to avoid accidental starting of the engine. Additionally, ensure the spark plug is torqued to the manufacturer’s specifications when reinstalling it to prevent damage.


In a nutshell, in this article, I give you information about the spark plug. The spark plug is a pivotal role in the running of your engines. Cleaning and replacing the spark plug at home is very effective and you can save your money and time by following these useful steps at your home.

Naveed Aanjum author

About Naveed A Hashmi

In my childhood, I used to see my parents while working in the land, for these reasons today I have been serving the same as our own tradition and culture. I thus love to stay in it, because I want to learn something advanced and new so that I may improve my farm’s contour and help others with my experience.

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