How do I fix my lawn mower from sputtering?

Remove the cap and check the gas tank for evidence of water (if you see the liquid separating or looking like two different colors). If there is water in your tank, siphon or drain it, then add new gas. After old gas in the line works its way through the mower’s engine it should stop sputtering and run like new again.

How do you fix a lawn mower that sputters?

Most repairs to stop sputter are cheap and part of your regular mower maintenance.

  1. Remove the cap of the gas tank and look in at the gas. …
  2. Turn the mower over so the oil case is sitting under the carburetor. …
  3. Remove the screw holding the air filter cover in place. …
  4. Check the underside of the unit for caked on grass.

Why is my lawn mower not running smoothly?

Causes: If the engine starts, but does not run smoothly, it means that the spark plug and ignition system are in order and you need to look elsewhere for the source of the problem. The usual culprit is air intake or fuel system related.

Why is my lawn mower chugging?

When a lawn mower surges, it sounds as if the engine reaches full speed, only to decelerate quickly. Typically, it doesn’t die, but the surging may repeat during the entire time the mower is in use. Like other small engines, mowers rely on a precise volume of gasoline and air for smooth operations.

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Why is my push lawn mower sputtering?

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.

How do you adjust the idle on a lawn mower?

How do you adjust the idle on a lawn mower?

  1. Loosen the set screw in the center of the air filter with a flathead screwdriver.
  2. Tighten the idle adjustment screw, found on the side of the carburetor, by turning it clockwise just to the point where you feel it lightly touching the seat of the carburetor.

Why does a lawn mower run rich?

A restricted air filter will cause an engine to run too rich. Remove the filter and check it then. If you have to prime the engine first to get it started, it could also be the float stuck. In the case of a diaphram carb, it could be the needle is stuck in the open position.

How do I know if my lawn mower carburetor is bad?

Dirty Carburetor Symptoms

  1. The lawn mower engine has trouble starting.
  2. The engine starts but stalls while you’re cutting the lawn.
  3. The engine runs rough during mowing.
  4. Black smoke is seen coming out of the muffler.
  5. There is a noticeable increase in fuel consumption during normal lawn mower use.
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