Why is lawnmower smoking? When your lawnmower starts smoking, the color of the smoke can be a crucial clue. It tells you what might be wrong with the machine. By noting whether the smoke is white, blue, or black, you can start diagnosing the issue.

The Meaning Behind White or Blue Smoke

White or blue smoke often points to an oil-related problem. This could be due to an oil spill on the engine or an overfilled oil reservoir. When oil burns, it produces white or blue smoke. This isn’t usually a fire hazard. But, it still means you need to address the issue before it harms the engine.

Check if you’ve tipped the mower or overfilled the oil. If oil has spilled, start your mower and let it run for a short while. The heat will burn off the excess oil. Don’t forget to follow your mower’s manual for the right way to fix oil leaks.

Diagnosing Black Smoke Issues

Black smoke suggests the mower is burning too much gasoline, a condition known as ‘running rich’. This could mean there’s a problem with the air and fuel mix. Typically, a dirty air filter or a faulty carburetor could be the culprit.

First, try replacing the air filter. If that doesn’t stop the black smoke, your carburetor might need an adjustment. Check the owner’s manual for instructions. If you’re not confident doing it yourself, consider seeking professional help. Remember that continued black smoke could signal more serious issues.

Common Reasons for Lawnmower Smoking

Dealing with an Overfull Oil Reservoir

An overfilled oil reservoir frequently causes white or blue smoke. A simple oil level check using the dipstick can confirm if there’s too much oil. If the oil level is above the recommended line, it’s time to drain the excess. Be careful to add oil gradually after draining to reach the perfect level.

Oil Spill on the Engine

Oil on the engine from spills or tipping the mower can also lead to smoking. If you’ve spilt oil, let the engine run a bit. The heat will burn off the spill. Always check your manual to know how to manage spills and prevent them while performing maintenance.

Running Rich: Too Much Gasoline

Black smoke typically indicates the lawn mower is using more gas than needed, known as ‘running rich’. This issue usually stems from a blocked air filter or a troubled carburetor. To fix this, inspect and clean or replace your air filter first. If the problem persists, your carburetor may require adjustment or professional service.

Troubleshooting Steps to Take

If you notice your lawnmower is smoking, there are several troubleshooting steps you can take on your own. These steps will help you resolve common issues related to oil and fuel delivery systems.

Checking and Adjusting the Oil Level

Start by checking the oil level. Remove the dipstick, wipe it clean, and insert it back to check the level. If the oil is over the ‘full’ mark, drain the excess. Then add oil slowly, checking the level as you go, until you reach the appropriate level as per your user manual.

Replacing or Cleaning the Air Filter

A clogged air filter can lead to black smoke. Locate the air filter and inspect it. If it’s dirty, replace it or clean it according to your manual. A clean air filter ensures your lawnmower runs smoothly and may stop the black smoke.

Carburetor Adjustment for Optimal Airflow

If black smoke continues after you’ve handled the air filter, your carburetor may need adjusting. Adjusting the carburetor helps control the mix of air and gas. If you’re unsure how to do this, your user manual will have specific instructions. Otherwise, seek a professional. This adjustment can be delicate, and a professional can ensure it’s done correctly.

When to Seek Professional Lawnmower Repair

Sometimes, DIY fixes don’t stop the smoke from your lawnmower. When smoke persists, it’s a sign that your lawnmower might have a serious problem, and professional repair could be necessary. It’s essential not to ignore continuous smoke as it could lead to long-term damage.

Persistent Smoking: Possible Serious Problems

If your lawnmower keeps smoking after you’ve attempted all the troubleshooting steps, then it could be suffering from more serious issues, such as damaged engine seals or faults within the crankshaft. Such complex problems require a professional’s touch. The ongoing white or blue smoke might suggest oil burning in places it shouldn’t, while persistent black smoke can be a sign of a deeper fuel mixture or combustion problem.

Warranty and Professional Service Queries

Before taking your lawnmower in for repairs, check if it’s still under warranty. A warranty may cover the cost of repairs or even a replacement. If the warranty has expired, or for issues not covered, look for a reputable repair service. Always ask about the repair costs upfront to avoid surprises later. And ensure they provide a clear explanation of the problem before any work starts.

Preventative Measures and Best Practices

To keep your lawnmower in good shape, prevention is key. By performing regular maintenance and selecting the right products, you can avoid smoking issues.

Regular Maintenance to Prevent Smoking

Regular maintenance is essential to prevent your lawnmower from smoking. Here are some steps to take:

Check the oil level before each use. Make sure it’s not too high or too low.
Clean the air filter regularly. Replace it if it’s worn out or very dirty.
Inspect spark plugs periodically and replace them if they’re faulty.
Look for fuel leaks and fix them. Leaks can cause smoking and are a fire hazard.
Keep the blades sharp. Dull blades strain the engine, which can lead to smoking.
Stabilize the fuel if you’re not using the mower for a while.

By following these steps, you can help ensure your lawnmower runs smoothly and smoke-free.

Choosing the Correct Oil and Air Filter

Using the right oil and air filter can prevent smoking and prolong the life of your lawnmower.

Use the recommended type of oil for your model, which you can find in your owner’s manual.
Pick the correct air filter size and type for your lawnmower’s make and model.
Change the oil and filter according to the schedule suggested by the manufacturer.

Make sure you’re buying high-quality oil and filters. While it may cost more upfront, it protects your lawnmower’s engine in the long run. Remember to take care when you’re pouring oil to avoid spills that cause smoking.

FAQs About Smoking Lawnmowers

When facing a smoking lawnmower, it’s normal to have questions. Below are clear answers to some common concerns.

Addressing Common Concerns and Misconceptions

Can low oil cause white smoke?

Yes, low oil might lead to white smoke. Always check the oil level first.

Do dirty air filters cause black smoke?

Yes, a dirty filter can block air flow, causing the mower to use more fuel and make black smoke.

Does white smoke mean a blown head gasket?

Not always. White smoke often comes from spilled oil or a low oil level, not just a gasket issue.

How much white smoke from the exhaust is normal?

Any white smoke hints at a problem. A good lawnmower should run without making white smoke.

Remember to consult the mower’s manual and seek professional help if you’re unsure about any issues. Regular upkeep can prevent smoking and extend your mower’s life.

Identifying the Cause by Smoke Color