A Comprehensive Guide to Finding the Right

Lawn Mower Spark Plug

lawn mower spark plug

Spark plugs are one of the most vital lawn mower parts. They make sure that your lawn mower is running efficiently, and prevent it from breaking down. However, finding the right spark plug for your lawn mower can be difficult. We have compiled a comprehensive guide on how you should go about finding the best spark plug for lawn mowers!

What is a lawn mower spark plug lawn mower is one of the most vital lawn parts. They make sure that your lawn runs efficiently, and prevent it from breaking down. However, find right lawn can be difficult. Compiled comprehensive guide lawn go about finding best grass for!

A Spark Plug is an essential lawn mower part. It ensures the lawnmower is running efficiently, and prevents it from breaking down. However, finding the right lawn mower spark plug can be a challenge. We have compiled a comprehensive guide on how to go about finding the best lawn mower spark plug!

When To Check & Replace Spark Plugs

For standard lawn mower and small engine maintenance, you should check and/or replace spark plugs:

  • Annually and in accordance with the Operator's Manual
  • If your lawn mower or outdoor power equipment won’t start

Why should you replace your lawn mower's spark plug?

The lawn mower spark plug is an essential lawn part. It ensures the lawnmower runs efficiently, and prevents it from breaking down. However, finding the right lawn can be a challenge. Compiled guide lawn go about finding best grass for! A Spark Plug is one of the most vital lawn parts. Ensures that your lawn mowers are running efficiently

How to change your lawn mower’s spark plug

Step 1: Remove existing spark plug

1. Disconnect the spark plug lead. Then, clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug.

2. Remove the spark plug using a spark plug socket.

3. Clean light deposits from the plug with a wire brush and spray-on plug cleaner. Then, use a sturdy knife if necessary to scrape off tough deposits. NOTE: Never clean a spark plug with a shot blaster or abrasives.

4. Inspect the spark plug for very stubborn deposits, or for cracked porcelain or electrodes that have been burned away. If any of these conditions exists, replace the spark plug.

Step 2: Put in new spark plug

1. Use a spark plug gauge to measure the gap between the two electrodes (one straight, one curved) at the tip of your spark plug Many small engines require a .030" gap. Check for the specifications for your model.

2. If necessary, use a spark plug gauge to adjust the gap by gently bending the curved electrode. When the gap is correct, the gauge will drag slightly as you pull it through the gap. 

3. Reinstall the plug, taking care not to over-tighten (15 ft. lbs. maximum). Then, attach the spark plug lead.

Precautions to take when replacing lawn mower spark plugs: First, don't touch anything metal around your lawn mower's combustion chamber or you might get zapped by live electricity; which can cause burns and other injuries. Second, make sure you use only replacement lawn mower parts that are designed to work with your model.

What is the common problem of a spark plug?

How can you tell if your spark plugs need attention? Your engine is a fine-tuned machine, and performance, fuel economy, and reliability are dependent on consistent delivery of air, fuel, and spark. Here are the signs of spark plug problems.

Excessive Fuel Consumption

Spark plug problems might cause your engine to consume more fuel than usual. As the (ECM) has no control over spark strength or oxygen content; it adds fuel to compensate for poor combustion. A properly functioning spark plug helps to ensure the emissions from your vehicle are kept at a minimum.

Unusual Engine Noise

The engine of your car emits a variety of noises, and most are perfectly normal. However, odd sounds or knocking can be the sign that you might need to change your spark plugs. If they're worn out, loose, or damaged in any way; it will cause abnormal noise when running the vehicle at high speeds.

Electrode Gap Clogging

A common problem with spark plugs is that the gap between electrodes becomes clogged over time. This happens due to deposits of oil, dirt or other materials inside the combustion chamber; which forces you to change them more frequently than recommended. A good way to avoid this issue is by having your vehicle regularly serviced, and by using high-quality fuel that doesn't contain additives such as ethanol or detergents.

Loss of Power

Spark plugs deliver the power needed to turn engine's cylinders; so when they're not up to par you won't enjoy your usual performance level. The power of an engine depends on a number of factors, but a spark plug is one of the key elements.

Hard Starting

Proper ignition is most difficult when the engine is “cold.” The ECM adds more fuel to account for poor vaporization, which can be difficult for a worn spark plug to ignite, resulting in hard starting, long cranking, or a no-start condition.

Poor Performance

A fouled or worn spark plug makes the engine work harder to produce power. This can result in sluggish performance, difficulty maintaining speed on steep grades, loss of top-end speed and acceleration, etc. On acceleration, spark plug are under particular demand to deliver a strong spark. Also, to ignite more fuel and generate more power.

Faulty spark plugs or weak ignition coils may not keep up with the demand. Examples of poor acceleration include a lack of responsiveness or delayed reaction when pressing your gas pedal. In this situation pushing down on the gas pedal does not immediately boost the speed of the vehicle. Also, it will appear like the engine is being overworked.

Rough Idle

When the engine is idling roughly, it’s most likely due to a worn spark plug. The gap between electrodes becomes larger as wear increases, which can cause an uneven firing of the ignition coil or multiple sparks at one time. Also this condition creates very high stresses on your entire electrical system and could result in costly damage if not corrected.

Check Engine Light

A check engine light is a visual indicator that your ECM has detected an issue. The trouble code refers to the area where the trouble was detected and what problem it's referring to. If you see a check engine light, this may indicate something as simple as low gas or dirty air filter, but could also be indicating failing spark plugs.


A misfire is a situation where the spark plug does not deliver an adequate amount of energy to ignite all fuel during combustion. As a result, part or all of your engine will lose power and the vehicle may experience any combination of poor acceleration, rough idle, loss of speed at highway speeds (especially on hills), increased emissions due to running rich, and reduced fuel economy.

What is the best lawn mower spark plug?

The best lawn mower spark plugs are made of high-quality materials, have good insulation capabilities and an advanced design that provides superior performance overall. Look for products which feature ceramic insulators since they don't get too hot under pressure, and have a secure fit for reduced risk of misfires.

What lawn mower spark plug is best?

That's a good question to ask before you decide which lawn mower spark plug to buy. All lawn mowers are different, and they're designed by professionals who know exactly what kind of products can help them perform at their best without compromising on safety or comfort.

The lawn mower's brand and model are one of the key factors to consider when choosing a new lawn mower spark plug. However, there are other elements which you must look at if you want your engine to last for years while being properly protected against misfires.