Airflow Issues. 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.

Similarly, What causes engine surging?

If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.

Also, What causes a 4 stroke engine to surge? What would cause a small 4cycle engine to “surge” rhythmically? Either your gasoline is old/bad or the carburetor is improperly adjusted; that’s a classic symptom of an engine that’s burning a fuel/air mixture that’s just a little too “lean” (not enough fuel for the air).


35 Related Questions and Answers Found ?

 

Which way does a Kohler engine turn?

Re: Kohler K341A rotation

All small engines turn counter clockwise, looking at the shaft end.

What causes a carbureted engine to surge?

Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines. The appropriate fuel system cleaner added to the fuel tank can open clogged passages in injectors and carburetors that may be causing the surge.

How do you adjust the governor on a John Deere lawn mower?

How to Adjust the Governor on a John Deere L110
  1. Park your John Deere L110 lawn mower on a hard, level surface and set the parking brake.
  2. Push the throttle lever to the full throttle position.
  3. Raise the hood.
  4. Loosen the nut just below the governor rod, using the 10 mm wrench.
  5. Turn the governor rod counterclockwise until it stops, using the needle-nose pliers.

What causes a small engine to rev up and down?

A carburetor that’s incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. Then slowly adjust the screws tighter or looser in turn until the mower runs and idles smoothly.

How do you adjust the throttle on a Honda lawn mower?

How to Adjust Throttle Cables on a Honda Lawn Mower
  1. Turn the lawn mower off.
  2. Slide the throttle lever into the “choke” position.
  3. Locate the Phillips-head screw that holds the throttle lever to the engine bracket.
  4. Grasp the throttle cable and pull it toward the lawn mower handle until it is tight.
  5. Attach the spark plug wire back to the spark plug.

How does a governor control speed?

A mechanical governor operates by centrifugal force pulling outward on spinning weights. Then, slower engine speed generates less centrifugal force on the weights, which allows more fuel to be delivered and increases the engine’s speed. Very quickly an equilibrium is reached.

Why is my Honda mower surging?

Re: Honda Engine Surging

It could likely be a bit of obstruction in a passage, or maybe even some varnish buildup on a jet that causes turbulence; a wire might pass through but it will still be irregular. It doesn’t take much to put small engines off their game, and the corn gas causes all sorts of issues like this.

What causes a lawn mower engine to sputter?

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.

How do you adjust the governor on a small 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.

Why is my mower surging?

Problems in the Fuel System

Since the hole is so small, it can plug up with dust or dirt during normal mowing operations. Check and clean the vent. Surging is also caused by water that got into the fuel. A mower left in a heavy rain or condensation on a hot summer day can choke the engine.

What is engine hunting?

Engine hunting is nothing but variation in the engine rpm continuously(fluctuating). the engine rpm may be varied continuously due to abnormal condition of centrifugal governor inside the fuel injection pump or fast idle control device.

What is surging and choking?

Surging= There is an unstable limit of operation of centrifugal and axial flow compressor, known as surging. The maximum mass flow rate possible in a compressor is known as choking flow. Choking means fixed mass flow rate regardless of pressure ratio.

How do I fix a small engine lawn mower?

How do you adjust the governor on an air compressor?

The adjustment is touchy and to increase unloading pressure you turn the screw clockwise and counter clockwise to reduce pressure. When the air compressor reaches it’s limit the governor is there to unload it preventing air pressure from building too high.

What is Governor droop?

Speed droop is a governor function which reduces the governor reference speed as fuel position (load) increases. All engine controls use the principle of droop to provide stable operation.

What is engine hunting and surging?

A surge is usually caused by a fuel system management or drivetrain operation failure. When an engine’s computer can “hunt” or “surge” at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system.

Why does my small engine surge?

If your lawnmower’s engine is surging it could be a problem with the carburetor. The carburetor mixes air and fuel to the perfect ratio for combustion. The jets have tiny openings that can easily be clogged by dirt or from corrosion caused by old fuel sitting in the carburetor.

Why does my Honda lawn mower only run on choke?

Only runs smooth on choke usually means there’s blockage somewhere in the carb, often in the main jet or nozzle area. Depending on the specific mower, it can be cheaper/faster/less drama to simply replace the carb.

What causes an engine to hunt and surge?

If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.

What causes a lawn mower engine to sputter?

How to Clean a Carburetor 101
  1. Turn off the petcock.
  2. Drain the fuel bowl(s)
  3. Remove the bowl(s)
  4. Clean the bowl(s)
  5. Remove the jets.
  6. Clean the jets.
  7. Reassemble with fresh gaskets.

What are the types of governors?

How do I adjust the carburetor on my lawn mower?

Turn the high speed screw first clockwise until the engine slows, then counterclockwise until it slows. Locate the center point where the engine idles best. Move the throttle from slow to fast then back to slow to test the adjustment. Place the cartridge, filter and cover on the mower and secure with the nut.

How do you clean a carburetor?

How to Clean a Carburetor 101
  1. Turn off the petcock.
  2. Drain the fuel bowl(s)
  3. Remove the bowl(s)
  4. Clean the bowl(s)
  5. Remove the jets.
  6. Clean the jets.
  7. Reassemble with fresh gaskets.

How do you clean a carburetor?

Your mower pulls in air from outside and mixes it with gasoline for the proper explosion inside the engine. A dirty air filter inhibits the flow of air into the carburetor. Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine.

How do I fix the governor on my Kohler engine?

How to Set the Governor Setting on a Kohler Engine
  1. Locate your governor.
  2. Verify the throttle linkage rod is connected to the lever on your governor.
  3. Loosen the nut that holds the governor lever to the cross shaft with your hex wrench.
  4. Push the governor lever towards the carburetor.
  5. Insert your nail into the hole that has opened up in the cross shaft.
  6. Remove the nail.

How do I adjust the carburetor on my Kohler engine?

How to Adjust a Carburetor on a 16 HP Kohler
  1. Set the engine on a hard, flat surface.
  2. Move the throttle to the “Slow” position.
  3. Locate the carburetor on the right side of the engine directly under the air filter.
  4. Turn the limiter cap with the flathead screwdriver until the tachometer reads 1650 plus or minus 75 rpm.

Why does my Briggs and Stratton engine surge?

Some engine types are famous for surging, the Briggs & Stratton 450, 500 and 550 series engines are fitted with a metal fuel tank and priming bulb style carburettor. The vacuum leak causes the surging, replacing the gaskets and cleaning the carburettor/tank will leave it like new, I promise.

How do I adjust the carburetor on my Kohler engine?

How to Adjust a Carburetor on a 16 HP Kohler
  1. Set the engine on a hard, flat surface.
  2. Move the throttle to the “Slow” position.
  3. Locate the carburetor on the right side of the engine directly under the air filter.
  4. Turn the limiter cap with the flathead screwdriver until the tachometer reads 1650 plus or minus 75 rpm.

How to Adjust a Carburetor on a 16 HP Kohler
  1. Set the engine on a hard, flat surface.
  2. Move the throttle to the “Slow” position.
  3. Locate the carburetor on the right side of the engine directly under the air filter.
  4. Turn the limiter cap with the flathead screwdriver until the tachometer reads 1650 plus or minus 75 rpm.

What are the three types of governors?

Following are the three different types of governors used in automobile vehicle:
  • Mechanical or centrifugal governor.
  • Pneumatic governor.
  • Hydraulic governor.

What causes lawn mower engine to sputter?