How do I fix my lawn mower surging?

How do I stop my lawn mower from surging?

A thin coating of engine oil on foam filters typically helps them attract dirt that could end up in your carburetor. Paper filters, however, only use their pleated medium to catch dirt and dust. An air filter is a quick fix that should be your first stop when troubleshooting a surging lawn mower.

What causes a lawnmower engine to 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.

Why is my Briggs and Stratton surging?

The mower is surging/hunting because the carb is dirty. The main jet needs to be cleaned. You may be able to clean the carb without removing the carb. There is a main jet at the bottom of the carb that retains the fuel bowl.

What does engine surging mean?

Engine surging is different from a difficult start or a no-start problem. “Surging” does not refer to a knocking engine or one that idles rough or stalls. 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.

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Why is my lawn mower starting then stopping?

It could be from a dirty carburetor, a malfunctioning spark plug, insufficient flow of gas to the engine or a clogged air filter. But if your lawn mower starts then dies, the causes could also be the same. The most common cause of why a lawn mower starts then dies can be due to a carburetor problem.

Can spark plugs cause surging?

3. Surging and Lagging. Another good indication that your spark plugs are dirty or worn is if your vehicle experiences surges of speed, resulting in a jerking acceleration. These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed.

What causes a Tecumseh engine to surge?

Surging. If the governor surges up and down, then the problem may be a plugged carburetor, a plugged idle circuit or a worn linkage. If you check these components and see that they work properly, then the set of the governor may be too sensitive. This means that it reacts too quickly and overcompensates for the speed.

Why does my Kohler engine surge?

Surging on small engines is very often caused by a lean condition. Since the carb is new, any leanness is likely due to a vacuum leak somewhere.

How do you adjust the governor on a Briggs and Stratton engine?

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. This will set the governor shaft on top of the governor spool.

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What causes surging in a small engine?

The fuel tank cap has a small hole, which allows air to flow into the tank and create back-pressure to help deliver fuel to the carburetor. Dust or dirt can plug up this hole. As a result, the carburetor won’t get enough fuel, leading to surging. Surging can also occur due to water contaminating your fuel.

How does the governor work on a Briggs and Stratton engine?

To control engine speed, a mechanical governor uses gears and flyweights inside the crankcase to detect changes in the load and adjusts the throttle accordingly. … This closes the throttle, limiting the air-fuel released into the engine. When the engine load increases, the crankshaft spins more slowly.

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