Question: Why Is My Lawn Mower Not Running Smoothly?

Why is my lawn mower running rich?

Poor compression results in an inability to draw in fuel making for lean running condition, or won’t start, won’t stay running condition.

If too much compression, then engine is hard to start.

I don’t have either of those problems.

The other possible reason for running rich is a stuck needle or float issue..

Is it better to run lean or rich?

Running lean can give you more power but to lean will blow your engine. Running too rich can also hurt your motor. Think of it when you are mixing gas for your weed wacker. It is always safe to add a little more oil than not enough to the mixture.

How do I fix running rich?

Car Running Rich: How To FixCheck The Air Duct’s Flap. The flap inside the air duct is an actuator that serves as choke. … Vacuum Lines And Hoses. Loosely connected or leaked vacuum lines and hoses can cause a vehicle to run rich. … Clean The Mass Airflow Sensor. … The Oxygen Sensor. … Change the spark plugs.

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

Replace the original wire with the in-line spark tester, and attempt to start the motor. Watch for the same intensity of a spark that you saw when the mower was cold, If there is little or no spark, the ignition coil is bad and needs replacement.

What causes a lawn mower engine to miss?

The spark plug ignites the fuel in the combustion chamber once it has been compressed. If the spark plug is no longer firing, or corroded with residue and cannot produce a strong enough current to properly spark the fuel, the engine may misfire or completely stop running altogether.

How do I fix the idle on my lawn mower?

How to Adjust the Idle on a Briggs & Stratton Lawn MowerLoosen the set screw in the center of the air filter with a flathead screwdriver. … 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.More items…

How do I clean the carburetor on my lawn mower?

Cleaning the lawn mower carburetor Remove the engine cover if necessary. Remove the air filter cover, the filter itself, and the air filter housing. Shut off the fuel valve, if available, or crimp the fuel line then detach it from the carburetor – be prepared for some fuel to spill.

How do you adjust the governor on a lawn mower?

To adjust the governor, you would loosen the screw on the bottom of the governor arm and push the governor arm so the throttle is wide open. Then you would turn the bottom “clip” (which is connected to the governor shaft) counter clockwise.

What does engine surging mean?

Engine surging is when an engine starts easily and accelerates smoothly, however after a few minutes at a steady speed, it either surges in speed or misfires. Misfiring happens when one of the cylinders of an engine’s combustion cycle fails.

How can you tell when a spark plug is bad?

Symptoms of Bad or Failing Spark PlugsSlow acceleration. The most common cause of poor acceleration on most vehicles is a problem in the ignition system. … Poor fuel economy. When a spark plug works correctly, it helps burn fuel efficiently in the combustion cycle. … Engine is misfiring. … Difficulty starting the vehicle.

How do you know if your spark plugs need to be changed?

7 Signs You Need to Replace Your Spark PlugsThe car is hard to start. The battery is often blamed as the culprit for a vehicle not starting. … The engine misfires. … The car gets poor fuel economy. … Rough engine idle. … Your car struggles to accelerate. … The engine is really loud. … Your ‘check engine’ light is on.

How can I make my lawn mower run smoother?

Here’s four spring time steps Briggs & Stratton recommends that apply to professionals as much as homeowners:Change the oil in the push mower. Engine oil needs to be changed annually for two reasons. … Replace the air filter. … Replace the spark plug. … Fill with fresh gasoline; add fuel treatment.

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.