How to Remove a Spark Plug from a Lawn Mower?

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Were you planning on mowing your lawn today, but the mower’s engine broke down?

Then the spark plugs in the engine can be blamed.

The spark plugs are without a doubt one of the most important components of a lawnmower engine. Also, it is the first component to inspect if your lawnmower engine won’t start or runs rough.

Let’s have a look at how we may remove the spark plugs utilizing the most common approach, which is to use a socket.

To decide the functionality of the spark plug you should have knowledge of how does lawn mower engine works.

How To Remove A Spark Plug From A Mower?

To loosen the spark plug, place the spark plug socket over the plug and crank counterclockwise. If you’re having difficulties ratcheting, don’t force it. You can end up hurting yourself. 

Apply lubricant instead and let it soak for a few minutes. After that, you should be able to remove the plug with ease.

It’s critical to utilize a spark plug socket since they’re particularly intended to safeguard the ceramic insulator. Using the wrong tools to remove or install a spark plug can cause serious harm.

We can surely remove the spark plug using a socket, but what if it is one of the things you don’t have in handy.

Don’t worry, we’ve got you covered. You can remove the spark plug even without a socket. Let’s see how

Spark plug removal in lawn mower

How Do You Remove a Spark Plug from a Mower Without a Socket?

Let’s have a look at the many approaches and challenges of removing a spark plug without a sparkplug socket

Step 1: Place the lawnmower on a flat area

To make access to the underside of the mower easier, place it on a level, flat surface. If you’ve been running the engine, let it cool down. 

Turning the lawnmower on its side might cause oil to leak from the reservoir and into other sections of the mower engine.

Step 2: Gather a few essential tools

A rubber piece in the wrench slot holds the spark plug in place, and it may be easily removed. If you don’t have a socket wrench, make a backup plan using the following items:

  • A piler
  • An adjustable wrench
  • A suitable size nut wrench
  • Strong magnet

Step 3: Remove the spark plug using a wrench

The spark plugs in a lawnmower are not the same size as those in a car. Their thread size is usually between 10 and 12 mm. To remove them, you’ll need a socket that’s roughly 13/16 or 3/4 inch in diameter.

As a result, you’ll need a wrench with the same size range. A box-end wrench will suffice if there are no impediments.

Rotate the spark plug in an anti-clockwise manner with the adjustable or box-end wrench.

Step 4: Pluck the spark plug, using a nose plier or similar tool

A plier with a ‘nose’ is another possibility. It has the appearance of a standard plier, but instead of the thick gripping strands, it has long metal grabbing strands.

It’s for grasping the nut on the spark plug. You’ll need a larger army, but it will suffice.

Step 5: Using A Magnet And A Wrench, Pry Them Out

There’s an easy method for removing it. Strong magnets or a screwdriver can be used at the end of the wrench. Bring the magnets up to the spark plug’s top terminal.

Due to its magnetic characteristics, it gets attracted to a magnet and can be drawn out.

We discussed how to remove the spark plug. But when should the spark plug be replaced?

Spark plug in lawn mower

When Should the Spark Plug Be Changed?

A few signs that indicate that a spark plug needs to be replaced are:

Hard Start

Starting the mower is more difficult than usual. A mower may require several pulls on the beginning rope before starting.

The spark provided by the spark plug may be insufficient to ignite the fuel and air combination already supplied to the cylinder by the carburetor.

Poor Engine Performance

If something is amiss with the spark plug, the engine may die out quickly after it eventually starts. While mowing, the engine may run for a short time before stopping. 

The engine must be restarted each time it dies, which becomes more difficult as the engine warms up.

Excessive Consumption of Fuel

If you find yourself filling up your lawnmower’s fuel tank more frequently than usual while or between mowing sessions, the spark plug might be to blame.

Gasoline does not burn entirely or effectively if the spark is inadequate. As a result, the mower’s fuel consumption rises but its fuel efficiency falls.

Physical Appearance

Removing the spark plug and inspecting it might provide further information about whether or not it is time to replace it.

The top of the middle electrode should be flat. If the top of the spark plug is rounded, it has to be changed.

Examine the porcelain sheath of the spark plug for fractures or chips, as well as pitting on the firing electrode. The spark plug must be replaced if it is damaged.


Look out for these tips to check when should you replace the spark plugs.

Sometimes due to the performance of the poor blade, the engine can be pressurized and heated up so make sure to sharpen the blades with sharpening tools on a regular basis.

And, now since you know how to change a spark plug in a lawn mower, you can keep your machine in good working order without having to get someone to do it for you.

If in case the engine does not work due to a spark plug do you think the engine can be interchanged? Get the answer from the article and do accordingly.

You may expect more money in your wallet, a more efficient mower, and a beautiful lawn if you have this talent in your back pocket.

About Tom Reynolds

My name is Tom Reynolds, and I like lawn mowing. When I was a kid, I used to help my dad in cutting grass using a reel mower, now, I have my own 6 different lawn mowers. Keeping my lawn healthy and beautiful gives me satisfaction, and I still enjoy working in my lawn.