Why Do Lawn Mowers Smoke

Why Do Lawn Mowers Smoke?

Mowing your lawn is a quintessential summertime activity. It’s a great way to get some exercise, and it can make your yard look nicer. But have you ever stopped to wonder why do lawn mowers smoke?

In this blog post, we’ll take a look at why lawn mowers emit smoke and what you can do to minimize it.

Why Do Lawn Mowers Smoke?

There are several reasons your mower might be smoking. Here are some of the most common causes:

1. Poor Compression

One possible reason your lawn mower might be smoking is that it has poor compression. When the engine isn’t working properly, it can cause the mower to smoke.

If you suspect that your mower has poor compression, you might want to take it to a mechanic to have it checked out.

2. Carbon Monoxide Poisoning

Another potential hazard of smoking lawn mowers is carbon monoxide poisoning. Carbon monoxide is a harmful gas that can cause headaches, nausea, and even death.

If your mower is emitting a lot of smoke, it’s essential to make sure you’re not breathing in any of the fumes.

3. Poor Fuel Quality

One of the most common causes of smoking lawn mowers is low-quality fuel. If you’re using gasoline that has ethanol in it, your mower might be emitting smoke due to the engine struggling to burn the ethanol.

Also read: Can I use synthetic oil in Kawasaki mower engine?

4. Not Enough Oil

Using a lawn mower without enough oil can cause it to smoke and even catch fire. If your mower is running low on oil, it’s important to add some before mowing your lawn again – otherwise, you risk damaging Burned Muffler.

If your lawn mower is smoking and you can’t seem to find a reason for it, it might be a good idea to take a look at the muffler. If the muffler is covered in soot, the engine is likely running too hot. To fix this, you might need to have the muffler replaced.

5. Brittle Cables

Smoking is sometimes caused by the engine being unable to get enough voltage. If your cables are brittle or have deteriorated, it can cause them to work too hard. This can cause them to heat up, potentially causing the engine to smoke.

6. Burned Spark Plug

Another potential reason your lawn mower might be smoking is a burned spark plug. If the spark plug is dirty, it can cause the engine to misfire. This can lead to excessive smoke and even a fire. If you think the spark plug might be the problem, you might want to have it replaced.

4612929411 15ec5d62ec c 1

What can I use to drain my lawn mower oil?

7. Out-of-Balance Blade

One other possible reason your lawn mower might be smoking is that the blade is out of balance. If the blade is uneven, it can cause the engine to work harder than it should.

This can lead to smoke and even a fire. If you think the blade might be the problem, you might want to have it balanced.

8. Carbon Buildup

If your lawn mower is smoking, it’s important to try and determine the cause. In many cases, the smoke is caused by carbon buildup.

Over time, carbon can build up on the engine, making it difficult to run properly.

If you think carbon might be the problem, you might want to take your lawn mower to a mechanic to have it cleaned.

9. Poor Air Filter

If your lawn mower is smoking, one of the first things you should check is the air filter. A clogged air filter can make it difficult for the engine to get enough oxygen, which can cause it to overwork and smoke.

If you suspect the air filter is the problem, you might want to replace it.

Also read: best riding mower jack

Different Types and Colors of Smoke Lawn Mowers Produce

There are different types and colors of smoke. Here’s a quick breakdown of the most common:

1. Black Smoke

Black smoke may look bad but it’s not a major cause for concern. It means that there is incomplete combustion because air and fuel aren’t mixing properly.

It can be caused by various issues, including poor fuel quality, low oil levels, or even out-of-balance blades.

To fix the black smoke problem:

  • Clean your air filter.
  • Remove the filter and clean it with soap and water.
  • Consider replacing the filter if it is worn or damaged.

2. White Smoke

White smoke may look like steam, but it’s a sign that the engine is burning oil. It can be caused by leaking gaskets or seals or accidental overfilling of the crankshafts with engine oil.

The smoke should clear up once the trace oil has reached the engine’s combustion chambers. Do not panic when new mowers emit white smoke. This may be the manufacturers’ oil residue that has to be burned off before the engines will run clean.

3. Blue Smoke

Blue smoke is a sign that there is too much oil and not enough air. This can be caused by leaks in the piston ring, valve guides, or piston ring seals.

Fixing the blue smoke problem will first require finding the source of the leak. In most cases, the oil leakage is caused by a bad gasket or seal on the engine.

Once these have been located and repaired, the blue smoke problem will clear up. It is, however, recommended to seek the services of a trained mechanic to ensure the problem is fixed correctly.

FAQs- Why Do Lawn mowers Smoke?

How Do I Stop My Lawnmower from Smoking?

Many types of lawnmowers will begin to smoke when they’re running out of fuel. Additionally, if there is too much oil in the fuel, the blades will smoke. If this is a problem, be sure to regularly drain all of the gas out of the tank.

What Causes My Lawn Mower to Smoke?

If the engine is running too hot, it might be caused by a defective muffler or a loose or dirty air filter. If the engine is running too hot and begins to smoke, you might need new cylinder heads, pistons, or valves.

What Does It Mean When My Lawn Mower Smokes?

If the engine is constantly smoking, you might need to replace parts in the carburetor or ignition. A clogged air filter can also cause it. Additionally, if your lawnmower smokes excessively, the engine has too much oil and not enough air.

Using your lawn mower is something that requires attention. If you notice that it’s starting to smoke, try to determine the cause as quickly as possible.

If you can’t figure out what’s causing the smoke, it might be best to take your mower to a mechanic for repairs.


  • Ricky

    Hi, I’m Ricky. I’ve been involved in lawn care and landscaping from when I was 15. To be honest, I didn’t like the idea of pushing mowers, collecting grass clippings, and maintaining flowerbeds at the time. But having seem the passion my parents had for gardening and outdoors and the effort they put in maintaining the health and beauty of our landscape, I couldn’t help but not only admire their hard work but also I became a part of it. As someone who loves to spend time with nature’s best, I find myself learning a lot more about gardening and outdoors on a daily basis. Not to mention I love to share the knowledge I’ve gathered over the years with my readers at We Mow Dallas. To be clear, I don’t have a Master’s degree in gardening or anything like that. Everything I’ve learned about gardening, landscaping, and lawn care spring from passion and engagement with my parents. And with a ton of free information out there, plus the ability to run tests and determine what works best for lawn care and landscaping, every day is an opportunity to learn and implement something new. My goal with We Mow Dallas is to teach you exactly how to maintain your lawn and landscape. And since I walk the talk in reality, you shouldn’t hesitate to join me in this wonderful world of landscaping and lawn care.

Leave a Comment

Your email address will not be published. Required fields are marked *