Why does my Briggs and Stratton engine run rough?

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving old fuel in the lawn mower. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the fuel filter and cause the engine to run roughly.

Why does my Briggs and Stratton surge?

The most common reason for a surging lawn mower engine is a blockage in the fuel supply, but there are other possibilities: Bad gas. Bad spark plug. Dirty / faulty carburetor.

What would cause a lawn mower to run rough?

A clogged or dirty carburetor causes the engine to run rough or prevents the engine from starting. If you can start the engine using starter fluid but the engine won’t continue to run, clogged carburetor jets may be the problem.

How can I make my lawn mower run smoother?

Here are seven ways to keep lawn mowers running like new:

1. Use a clean air filter.
2. Use a clean fuel filter.
3. Replace the oil.
4. Replace the spark plug.
5. Check the blade.
6. Check tire pressure.
7. Clean the undercarriage.

What causes a small engine to rev up and down?

A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue. If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down. When the blockage moves or clears, the engine may suddenly rev up in response.

Why does my lawn mower sound like it is surging?

When a lawn mower surges, it sounds as if the engine reaches full speed, only to decelerate quickly. Like other small engines, mowers rely on a precise volume of gasoline and air for smooth operations. If either of these is exceedingly rich or lean, surging may result.

What does it mean when your lawn mower sputters?

Dirt in the system as well as bad fluids will make the mower perform inefficiently. Sputtering of the engine while mowing is often an indication of bad mower maintenance, not a fault with the machine. Most repairs to stop sputter are cheap and part of your regular mower maintenance.

Why does my lawnmower start then stop?

If your lawn mower starts, runs briefly, then dies these are the four most common reasons that’s happening: Dirty carburetor / clogged carburetor bowl. Old gasoline that has gone bad. Dirty or defective spark plugs.

Another thing that effects a warm engine running rough is a coil going bad. You need to look for something temperature related. Cleaning carburetor, spark plug, gas, flywheel key and mag spacing wouldn’t have anything to do with the engine temperature. Three different spark plugs with same result. Could the magneto be bad?

Is there a problem with my Briggs and Stratton V twin?

I’m having issues with my Briggs and Stratton 20 hp V twin running rough under load. The details of the engine are as follows. This engine has been well maintained but has had a backfiring problem I since the first year I owned it.

What to do about a small Briggs and Stratton engine?

To test and fix, check out our Small Engine Ignition Systems FAQ or reach out to your local Briggs & Stratton dealer for advanced repair help. Air-fuel compression is crucial to engines powering lawn mowers and outdoor power equipment.

What should the RPM be on a Briggs and Strat?

You are running around 1600 rpm on an engine that is designed to operate at 2800-3600 depending on blade length. Until the engine gets into that range it will hunt and surge. And you cannot properly diagnose anything else until that is corrected. You must log in or register to reply here.