Question: How does auto choke work on lawn mower?

The engine is in the default choke position when cold, an air vane, opens the choke when the engine starts. … It has a thermostatically controlled arm (activated by muffler heat), that holds the air vain in the open position once it reaches operating temperature.

How does auto choke work?

Automatically – An automatic choke uses a metal spring to open and close the choke plate. The spring is wound in a housing and attached to the choke linkage on one end. As the engine warms up, it warms the metal spring. As the spring warms, it expands, rotates, and opens the choke plate.

Why do I have to run my lawn mower with the choke on?

Lawn Mower: Only Runs With The Choke On. … If your lawnmower will start and run with the choke on but dies when the choke is turned off, it may have a problem with the carburetor. The carburetor brings air and fuel together and mixes them in the perfect ratio for combustion before they enter the engine.

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Is it bad to run an engine with the choke on?

Leaving the choke on while operating will result in excessive fuel consumption, irregular engine power performance and eventually may even damage the engine. … Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting.

Is manual choke better than electric?

electric chokes can be a pita when the engine is warm but been shut off just long enough to cool the choke coil spring down, then the choke comes on when it really isn’t needed. They do work well and are easy to use when it’s cold but in my opinion a manual is still the best if the operator knows how to use it.

Should choke be open or closed when starting lawn mower?

Open the choke all the way if you notice that it has been closed. If it has been open, the carburetor may be flooded. … When you get the engine to sputter, open the choke, and try starting the mower. After it turns over, close the choke to keep the engine running.

Why does my mower only run when I push the primer?

When you prime the engine you are manually adding extra fuel in, so the running issue is most likely related to poor fuel that will not burn unless there is an excess amount present or a fuel deliver issue preventing enough fuel from getting through to begin with.

Why does my lawn mower only run for a few seconds then dies?

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.

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How long should electric choke stay on?

At 5°-10°C (41°-50°F), the choke plate should be fully open in about ten minutes. Check for bent choke linkage and a defective thermostat cap. And ensure the fast idle cam (screw) is properly set.

How do I know if my electric choke is bad?

If it pulls the blade completely of in 5 minutes, then it’s working. If it doesn’t get the blade vertical and hold it there in 5 minutes, then the choke needs adjustment or it’s not working properly…

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