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That is caused by too much gas getting into the engine after the key is turned off. If the mower is new enough to have a anti-backfire solenoid on the bottom of the carb then it must not be working. If it is an older mower and doesn't have one then the carb needs adjusting to back off the amount of gas.

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Q: Why does a riding lawnmower backfires when you turn it off and how can you stop it?
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Why would your ride-on lawnmower backfire?

If it backfires while you are driving, the intake manifold bolts may be loose or the gasket may need to be replaced. If it backfires when you turn off the ignition, the fuel mixture is a little on the rich side.


Is there an ignition on lawnmower that you have to turn on?

Not on a push mower that has no electric start. On a riding mower, yes there is an ignition key.


Riding lawnmower stopped while running will not turn over?

Sounds like the engine seized up from overheating or running without oil, although there could be other causes.


Where is the solenoid switch located on riding lawnmower?

the solenoid switch on a riding lawnmower is located at the bottom of the carburetor bowl, its used to turn the fuel on and off. some older models don't have the solenoid. Also,there is another solenoid switch for the starter i think that's the one you want, that's located under the gas tank on the right hand side on the frame. good luck


Murray riding lawn mower won't turn off?

Let it run out of gas. or put a kill switch coming from the condenser and ground it to the body of the lawnmower.......the contact with the frame should ground out the motor thus killing the motor


How do you open the dipstick to add oil to weedeater lawnmower?

Turn counterclockwise.


How do you remove the key way from a victor canon lawnmower?

Turn it 90degrees right then turn it180 degrees


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Hustler 3700


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Why Motorcycle wont start backfires?

its half a turn out of time. plug fouled install a new spark plug


Why does your lawnmower run rough and then keep idling after you have shut it down by releasing the stop bar?

The engine is running rich. Clean or replace the spark plug and the air filter. If problem persists, close (turn clockwise) the needle valve on the carburetor 1/8 turn.


How do you stop a horse from breaking a fence?

if you are riding the horse pull its reins to the side to twist there head that way and use the reins to give them a pop to turn around.