How Often to Change Lawn Mower Spark Plug

It’s important to change your lawn mower spark plug regularly to keep your engine running smoothly. But how often should you change it? The answer may surprise you…

Most experts recommend changing your spark plug every 25 hours of use. So, if you use your mower for an hour each week, you should change the spark plug every six months or so. Of course, this varies depending on the type of mower you have and how well you maintain it.

It’s important to keep your lawn mower in good working order, and part of that is changing the spark plug when it needs it. How often should you change the spark plug in your lawn mower? Ideally, you should change the spark plug in your lawn mower every year.

However, if you don’t use it very often, you can get away with changing it every other year. If you notice that your lawn mower isn’t running as well as it used to, though, it’s a good idea to check the spark plug and see if it needs to be changed. Changing a spark plug is easy to do yourself, and only takes a few minutes.

It’s worth doing regularly to keep your lawn mower running smoothly.

How to Tell If a Lawn Mower Spark Plug is Bad

If you’re having trouble with your lawn mower, one of the first things you should check is the spark plug. A bad spark plug can cause all sorts of problems, from a lawn mower that won’t start to one that runs rough. Here’s how to tell if a lawn mower spark plug is bad:

1. Check the gap. The gap between the electrode and the ground wire on the spark plug should be .025 inches. If it’s too wide or too narrow, the sparkplug isn’t firing correctly and needs to be replaced.

2. Look for wear and tear. Over time, the electrode on the sparkplug can become worn down, making it harder for sparks to jump across the gap. This will eventually lead to a loss of power and efficiency in your lawn mower.

Inspect the electrode carefully – if it looks damaged, it’s time for a new sparkplug. 3. Check for deposits. Over time, deposits can build up on the electrode or ground wire, preventing sparks from jumping across properly.

How Long Do Spark Plugs Last in Lawn Mowers?

Spark plugs are an important part of lawn mowers and other small engines. They help create the spark that ignites the fuel in the engine, making it run. Without a properly functioning spark plug, your lawn mower won’t start or run properly.

So how long do spark plugs last in lawn mowers? It depends on several factors, but generally speaking, you can expect a quality spark plug to last for around 100 hours of use. Of course, this will vary depending on how often you use your lawn mower and what kind of conditions you’re operating it in (dusty, wet, etc.).

If you notice that your lawn mower isn’t starting as easily as it used to or if it’s running less smoothly than normal, chances are good that the spark plugs need to be replaced. Replacing them is a fairly simple process that anyone can do with just a few basic tools. Once you have new spark plugs installed, your lawn mower should be back up and running like new again!

How Do I Know If My Spark Plug is Bad Lawn Mower?

If your lawn mower is having trouble starting or staying running, one possible cause is a bad spark plug. A spark plug creates the spark that ignites the fuel in the engine, so if it’s not working properly, the engine won’t run. There are a few ways to tell if your spark plug may be bad and in need of replacement.

First, check the condition of the spark plug. If it’s black or covered in soot, that’s an indication that it’s not firing properly. Also, look for any cracks or damage to the ceramic insulation around the electrode.

If you see any of these signs, it’s time to replace the spark plug. Another way to tell if your spark plug is bad is by checking the gap between the electrode and ground strap. The gap should be between .020 and .040 inches; if it’s too wide or too narrow, the spark plug isn’t firing correctly.

You can adjust the gap with a feeler gauge; instructions on how to do this can be found in your lawn mower owner’s manual. If you’re still not sure whether or not your lawn mower’s spark plug is bad, take it to a qualified repair shop for diagnosis and replacement.

How To Check, Clean & Replace Lawn Mower Spark Plug


If you want your lawn mower to run smoothly, you need to change the spark plug regularly. Depending on how often you use your lawn mower, you should change the spark plug every few months to keep it running properly.