It depends on what model the mower is. Most of the newer mowers have the choke incorporated with the throttle. As you raise the throttle lever you will get to a part that it fits in a small grove. That is full throttle. Everything past that is the choke.
grab it around the throat (carburetor) and choke it until it starts.
If you have to run it with the choke after it has warmed up, you need to disassemble the carb for cleaning.
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If you have to turn the choke on a little, the motor is starving for fuel. need to clean the carburetor
By backing the choke out I assume you mean turning it off. If it stalls when the choke is off but runs while it is on then you have an air leak somewhere
Most mowers unless electric have a lever that works as a throttle/choke to start your mower. If you just pull back on the lever till the throttle/choke no longer allows gas to the engine this usually shuts it off.
Depends how bad its seized. Sometimes you can try to spin the crankshaft and knock it loose. If that works, it should still be torn down to check for cylinder damage. If it seized in the first place, there is internal damage somewhere.
The choke on a riding lawnmower is typically a lever on the "dashboard." Often it is near the lock. The choke is used primarily when starting a riding mower that is cold and often it is not necessary to use the choke after the engine has been running. The choke, when engaged, allows more fuel and less air to reach the spark plug in the engine. The higher concentration of fuel is easier to ignite and thus the engine is easier to start. Once the engine is running and warm, the choke should be disengaged.
A problem with a hard to start lawn mower can possibly be fixed by playing with the choke mechanism. Turn the choke all the way out and pump the gas three times, then close the choke nearly all the way and try the key. If the mower does not start, try again pumping only twice.
MY lawn mower will start to sputter if I run the choke on after the motor is warmed up. It's getting fed too much fuel. Ease off on the choke and it will run better, usually.