Why does my snowblower surge?

Lean causes the surging because as the engine accelerates to top speed the carb's main (high speed) circuit mix goes lean. Unable to sustain full speed because of the lean mix, the rpm drop down until the mix gets rich again from the idle (slow speed) circuit.

Click to see full answer

Also, why is my Craftsman snowblower surging?

Idle is smooth. With the throttle in the fast position (full throttle) the engine surges, unless there is alot of snow going into it, then it will smooth out at high speed, but as soon as the load is off, it will start surging soon or immediately. Returning the throttle to low idle will smooth out the surge.

Beside above, is it OK to run snowblower with choke on? When the passages start to plug up the engine does not get the needed fuel to run smoothly. Then when you choke the engine, it delivers more fuel and the engine will smooth out. Please use extreme caution when dealing with fuel. Then after you have cleaned the carburetor, start the engine and slowly turn the choke off.

One may also ask, why does my Ariens snowblower surge?

If it's surging or hunting try to give it a little choke and see if it settles down. If so it's running lean and might be something is loose and allowing an air leak or there is a problem with the carburetor.

What does it mean when your snowblower backfires?

If your snowblower is backfiring, the problem can be traced back to one of three reasons. The first one is running too lean. The second issue could be incorrect timing (this could be about the valve or the spark); and the third issue that could be causing the backfire is the inlet valve not seating correctly.

38 Related Question Answers Found

Why does my snowblower start then stop?

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the snowblower for a long period of time. This sticky fuel can clog up the carburetor and cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner.

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.

Why is my Toro snowblower running rough?

A clogged carburetor is most commonly caused by leaving fuel in the snowblower for a long period of time. This sticky fuel can clog up the carburetor and cause the engine to run roughly. If the carburetor is clogged, try cleaning it with carburetor cleaner.

Why does my small engine surge?

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.

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.

How do you clean a carburetor?

How to Clean a Carburetor 101

Turn off the petcock.
Drain the fuel bowl(s)
Remove the bowl(s)
Clean the bowl(s)
Remove the jets.
Clean the jets.
Reassemble with fresh gaskets.

What causes a 2 cycle engine to surge?

Problems in the Fuel System

This vent is just large enough to allow air into the tank, creating enough backpressure to aid in fuel delivery to the carburetor. 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.

How do you adjust the governor on a Tecumseh engine?

Loosen the screw at the base of the governor arm with a screwdriver. Rotate the governor arm in the same direction as it moved when the throttle lever was moved to wide open. Hold the governor arm in this position with one hand and tighten the screw at the base of the governor arm with the other hand.

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.

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 Kohler engine to surge?

Re: Kohler engine surging, seems to be governor

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.

Why does my lawn mower surge at idle?

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.

What would cause a generator to surge?

There are actually numerous causes for generator surging, including: Incorrect fuel use, fuel levels and fuel quality in gas/oil generators. Your generator was designed to utilize specific fuel sources, and anything else may cause problems in operation (and irreparable damage). Failing capacitor or other components.

How do you change the governor on a Kohler Engine?

How to Set the Governor Setting on a Kohler Engine

Locate your governor.
Verify the throttle linkage rod is connected to the lever on your governor.
Loosen the nut that holds the governor lever to the cross shaft with your hex wrench.
Push the governor lever towards the carburetor.
Insert your nail into the hole that has opened up in the cross shaft.
Remove the nail.

Why does my generator rev up and down?

There are two possible problems that could be causing this revving up and down of your RV's generator. The first is a fuel problem or possibly a problem with the governor on the generator. Generators need to run at least once a month for a couple of hours with a load on them.

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 a surging engine?

Surging is when the engine revs change noticeably under constant load and constant throttle (which in theory should result in constant RPM).