Tip & How-To about Garden

Lawnmower fuel pop

Does your lawn mower or small engine give a big pop or bang when u shut it off after it has run and heated up for a while? I think this is from the hot exhaust egniting the gas fumes still coming through the engine. This may clean the carbon out of the muffler, but it may shorten the life of the head gasket. Either or it sure does scare bystanders, and wakes up the neighbors. To keep this from happening, just let the engine run at low idle for 30-40 seconds before shutting of the spark. Works for me.


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I have a briggs and Stratton 22 hp Intek V-twin engine on our Craftsman riding mower. After about 30 minutes of mowing the engine suddenly began to run rough, loud and out of sync.

my thought is the valves are out of adjustment. that is the popping you hear or backfiring. i think if you take off and clean the carburetor and set the valve lash it will probably run like a new one.

May 17, 2016 | Garden

1 Answer

mower runs for a few seconds and stops

can you give the model and type on this engine how did you check the carburetor

Jun 06, 2013 | Garden

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Engine backfires, runs only at low rpm, seem to be flooding

The unit in the bottom of the float bowl is an anti fire solinoid, when the ignition is switched off a small needle is inserted into the main jet in the carb, the idea is to stop fuel entering the engine as the engine shuts down, if fuel enters the engine as it is shutting down it is sent out the exhaust valve and into the hot exhaust, this in turn can and does cause a massive bang, you can test this by removing the unit from the bowl, switch the ignition on, the centre needle should retract into the units body, if not it is bad and will stop the engine from reving.

Apr 06, 2013 | Craftsman YT 3000 42" Briggs & Stratton 21...

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Steiner lawn mower

Might be Coil Breaking down under heat. Not sure best way to diagnose other the cross your fingers and buy a new coil. Sounds like you did everything you could do Fuel -wise.

Oct 02, 2012 | kawasaki Garden

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