How to Fix a Lawn Mower Blowing Blue Smoke

Maintaining a healthy and beautiful lawn involves a vital piece of equipment, that is, your lawnmower. Lawnmowers are a necessary part of any yard work arsenal, and they come in a variety of types and sizes. While most lawn mowers are simple machines that do their job without any issue, problems are inevitable no matter how much caution used. One of the problems you might encounter is a lawnmower blowing blue smoke.

What causes a lawnmower to blow blue smoke?

If your lawnmower is blowing blue smoke, there are some possible causes and solutions.

The lawnmower is overfilled with oil

This is the most common cause of blue smoke coming from a lawnmower. When too much oil is added to the lawnmower, it will begin to burn off and create blue smoke. The solution to this problem is simple: drain some of the oil out until it reaches the correct level.

It’s highly recommended to keep your oil levels in check. To check the oil level, you can use the dipstick that’s usually located near the oil fill cap. Have it removed and wiped before checking. If the oil is below the safe line, add more oil until it reaches that level. If it’s above the line, then you know what to do.

The lawn mower’s air filter is dirty

Another possible cause of blue smoke is a dirty air filter. A lawnmower needs a clean air filter to function properly, and when it’s dirty, it can cause the engine to run lean and produce blue smoke. To fix this, simply clean or replace the air filter.

The lawn mower’s spark plugs are fouled

Fouled spark plugs can also cause a lawnmower to blow blue smoke. When the spark plugs are fouled, it means they’re not firing correctly and this can cause the engine to run lean and produce blue smoke. The solution is to clean or replace the spark plugs.

The lawnmower has a fuel system problem

A lawnmower with a fuel system problem will also blow blue smoke. This is because the fuel isn’t being appropriately burned, and it’s causing the engine to run lean and produce blue smoke. The solution is to have the fuel system cleaned or repaired.

The lawnmower has an engine problem

Another potential cause of blue smoke is an engine problem. An engine that’s not running properly can cause the lawnmower to run lean and produce blue smoke. The solution is to have the machine repaired or replaced.

The lawnmower is using the wrong type of oil

If you’re using the wrong type of oil in your lawnmower, it can also cause blue smoke. For example, using regular motor oil in a lawnmower that requires synthetic oil will cause blue smoke. Always check your lawn mower’s user manual to see what type of oil is recommended.

The lawnmower has leaking seals

Blue smoke can also be a result of damaged or leaking seals. This is because the engine oil is escaping and being burned up along with the gasoline. To fix this problem, you’ll need to replace the damaged seals.

The lawnmower is being stored improperly

Did you know that improper storage can also result in your lawnmower blowing blue smoke? For example, if you’re storing it in a garage that’s not well-ventilated, the oil can start to break down and cause blue smoke. Always store your lawnmower in a cool, dry place.

The lawnmower has a damaged head gasket

A damaged head gasket can also cause blue smoke. This is because the engine oil is leaking into the combustion chamber and being burned up along with the gasoline. You’ll need to replace the head gasket with a new one to fix this problem.

These are just some of the possible causes of blue smoke coming from a lawnmower. If you’re still having trouble after trying these solutions, it’s best to take it to a lawnmower repair shop for further diagnosis but don’t worry; we got you covered!

Whether you have commercial or residential lawn mower equipment, Greg’s Small Engine Service and Repair specializes in lawn mower service. We have the tools and experience to service a wide variety of lawn mower types.

Our commitment to quality and professional lawn mower repair means our customers in the Reno, Carson City and Incline Village area save money and time on their small engine and lawn mower service needs.