What causes a lawn mower engine to sputter?

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.

How do I stop my lawn mower from sputtering?

Your mower pulls in air from outside and mixes it with gasoline for the proper explosion inside the engine. A dirty air filter inhibits the flow of air into the carburetor. Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine.

Why is my lawn mower not running smoothly?

If your lawn mower cuts out, smokes, idles poorly, vibrates or runs erratically, it could need a good tune-up to replace the spark plug, oil and air filter. Or the problem could be with the lawn mower’s fuel system. Rebuild or replace the carburetor if the engine isn’t getting a good supply of fuel.

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Why is lawn mower smoking and sputtering?

A lawn mower engine will puff out black smoke when the fuel and air mixture is too rich. Because there isn’t enough air, combustion is incomplete, and the unburnt fuel in the combustion chamber turns to smoke. … The most common cause of black smoke in a lawn mower is a dirty air filter, and that’s easy to fix.

Why does my lawnmower stutter?

Clogged or Dirty Air Filters

It is one of the most common problems that cause lawnmowers to sputter. The mowers take the air from the surrounding through air filters and mix it with fuel inside the engine. So, if the air filter is clogged or dirty, it will affect the flow of air into the carburetor.

Can a spark plug cause a lawn mower to sputter?

Cause: a dirty or bad spark plug can make your lawn mower difficult to start; it can also cause the sputter engine. Although a dirty or damaged spark plug is not a major cause of a sputtering engine, it may just be the cause of your mower sputtering.

How do I know if my lawnmower spark plug is bad?

The spark plug in a lawn mower could be bad if:

  1. You can’t get the engine to fire up at all.
  2. You have to tug extra hard for longer than usual on the rewind.
  3. Your lawn mower loses power while moving.
  4. The gas runs out quicker than it used to.

Why does my lawn mower keep rev up and down?

A carburetor that’s incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. One screw controls the idle speed while the other adjusts the idle mixture.

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What are the symptoms of a blown head gasket in a lawn mower?

Signs & Symptoms of a Blown Lawn Mower Head Gasket

  • Leaking Oil. Examine the mower for any signs of oil leaking from the gasket. …
  • Low Pressure. If the mower is dropping out or not starting and you do notice the oil leak, you have a bad gasket. …
  • Smoke From the Exhaust.

What happens if you put too much oil in your lawn mower?

Too much oil in your lawn mower may cause the engine to not run well and cause damaging results. Too much oil can cause your engine to overheat which can result in seal damage, blown gaskets or becoming hydrolocked.

What can you do with a lawn mower engine?

7 Projects That Add New Life to Your Old Lawnmower Engine

  1. Build a DIY Generator Using a Lawnmower Engine. …
  2. Build a Wooden Go-Kart. …
  3. Lawnmower Engine Powered Mulcher. …
  4. Homemade Power Wheelbarrow. …
  5. Convert it into an Outboard Boat Motor. …
  6. Build a MINI-BEEP. …
  7. Power Your MINI-DOZER MD196K Bulldozer.