Why is my mower sputtering and backfiring?

Why is my mower sputtering and backfiring?

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 is my riding lawn mower sputtering?

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.

What does it mean when a lawnmower backfires?

Backfires occur when burning fuel enters the engine or the exhaust. If pockets of unspent fuel enter the engine before the valves close or escape to the exhaust system, a backfire occurs. Unspent fuel ignites when a spark occurs in close proximity to the fuel pocket.

How do I fix my lawn mower from sputtering?

How to Fix a Sputtering Lawnmower

1. Remove the cap of the gas tank and look in at the gas. Inspect the gas for signs of water.
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.

How do you fix a backfire on a lawn mower?

Possible Fixes for Backfiring:

1. Lower engine speed slowly.
2. Follow small engine fuel recommendations and/or switch to brands with low or no alcohol.
3. Adjust carburetor for optimum performance.
4. Inquire with equipment manufacturer about increasing air volume to decrease engine temperature.

What causes a motor to backfire?

An engine backfire is what occurs when the combustion event takes place outside the engine’s combustion cylinders. If the timing of the spark is a bit too late in the engine cycle, unburnt fuel and air may be allowed to flow through the exhaust.

Why is my lawn mower smoking and sputtering?

Leaking oil from the exhaust is the usual cause of blue, white or black smoke from a lawn mower. Perhaps the most startling one happens when you pull the cord and the engine sputters into action, only to be followed by clouds of billowing smoke from the motor and under the mower deck.

What causes an engine to backfire?

A backfire is caused by a combustion or explosion that occurs when unburnt fuel in the exhaust system is ignited, even if there is no flame in the exhaust pipe itself. Sometimes a flame can be seen when a car backfires, but mostly you will only hear a loud popping noise, followed by loss of power and forward motion.

Is your lawn mower sputtering?

But even with regular maintenance, there may be times when you experience issues with your mower. One common problem among lawnmowers is sputtering. Lawn mower sputtering is generally an inexpensive and easy fix that can be done on your own as part of your regular maintenance.

Is it dangerous for a lawn mower to backfire?

A mower that backfires is irritating, but thankfully backfiring is not a danger to your engine and lawn mower. While it’s not dangerous, it can be a symptom of other problems, and should be addressed.

Why does my lawn mower backfire through the carburetor?

Water contaminating the fuel presents another possible cause of both backfires and power loss. If you suspect water in the fuel tank, empty the gasoline and dispose of it properly. Add fresh fuel, and then fire up the mower. A lean carburetor has too much air and too little fuel in the mix.

What does backfire and afterfire mean Briggs and Stratton?

This FAQ from Briggs & Stratton will help you identify the problem and find solutions. Backfire is a condition described as a loud bang, poof, explosion, etc., while the engine is running or while shutting down. Afterfire occurs after the engine has been shut off.