Why is my lawn mower spitting out black smoke?

Why is my lawn mower spitting out black smoke?

Black smoke may indicate that the mower is “running rich,” or burning too much gasoline. Your lawn mower’s carburetor regulates the ratio of gasoline to air mixture. It’s possible that a dirty or clogged air filter is preventing sufficient airflow into the carburetor. Try replacing the air filter.

Why is smoke coming out of my John Deere lawn mower?

Engines rely on a mixture of air and fuel for proper operation. A dirty air filter robs the lawn tractor’s engine of air. As a result, the machine runs poorly and may bellow black smoke, a signal that the air-to-fuel ration is too rich. If the mower’s air filter is made of paper, then it can be replaced.

What causes lawnmower to sputter and backfire?

Clogged or Dirty Air Filters Dirty air filters are one of the most common reasons lawn mowers sputter. Dirt can be present in the apertures that lead from the carburetor and the fuel filter and interrupt the flow of fuel supply to the combustion chamber. You want to be sure to clean or replace dirty air filters.

Why does my riding mower keep stalling?

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner.

Why does my John Deere lawn mower backfire?

The problem might be faulty intake and exhaust valves, a clogged carburetor, or a misfiring spark plug. While you’re trouble-shooting, Louwerens advises you to be careful, because he once saw a lawn mower catch fire while it was being checked for backfiring.

What does it mean when a lawn mower blows white smoke?

burning oil
White smoke indicates that the engine is burning oil. This is usually due to a spill or accidental overfilling of the crankcase. As soon as the trace oil that has reached the engine is burned off, the smoke should clear up and your mower will operate fine.