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The engine is receiving more gas than it can consume. Sometimes the carburetor needle valve will vibrate to the open position or the float valve will stick open. Also, a fouled spark plug will not provide sufficient spark to ignite the fuel. Check out a lawn mowers and small engines repair manual from your public library for troubleshooting and repair procedures.

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Q: What causes a mower engine Briggs Stratton 25hp to surge with gas and flood out after starting normally?
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Related questions

What causes a 24hp Briggs and stratton to pop at low speed?

Lean Misfire


What causes a Briggs and stratton engine idle speed go up and down?

The most common cause of engine surging (rev up and down) is a dirty air filter.


What causes a Briggs and stratton 3.5 to stall when running?

Generally the most common problems with these engines is fuel-related, though ignition can be a problem if the blade has struck something shearing the key.


You have oil leaking out of your air filter on your Briggs and stratton engine?

the valves or rings are allowing compression blow by to enter the crankcase which causes excess pressure that is brought to the carburetor by the breather tube. your engine is getting tired or you have too much oil in the crankcase.


What causes surging on 5hp Briggs and Stratton lawn mower?

The most common cause of surging is a dirty air filter. EPA approved carbs tend to run lean causing the surge condition described. Main jet needs to be replaced with next size larger.


What causes the blower not to operate normally but when the key is held almost in the starting postition it operates correctly?

Time for an IGNITION switch


Briggs and Stratton 8hp new runs only few minutes and then quits. then when it cools down you can restart and run again for few minutes . What causes this?

one reason for this is the air inlet on the petrol cap is blocked or too small causing a vacuum in the petrol tank and starving the motor.


What causes a 17.5 Briggs and Stratton mower shut off after 30 seconds or so?

Answer Can be a clogged fuel filter, or possibly a fuel pump going bad. Replace the filter and see if this fixes the problem. Also, be sure the fuel tank is properly vented and/or the vent in the fuel cap is not plugged with dirt.


Why is a 24hp briggs and stratton intek engine difficult to get the motor to turn over at times?

The rocker arm clearance tends to loosen in these engines. This causes too much compression at the wrong time resulting in hard starting. Most people think the battery is weak but a relatively simple adjustment of the valve/rocker arm clearance should solve your problem. Check your manual and YouTube for instructions or consult your local mower shop.


What causes my 18 hp Briggs and Stratten motor to stall after it runs for a time?

Its out of gas


What causes a 16.5 hp Briggs and Stratton to fill the cylinder with fuel when it is shut off?

The carburetor float may be stuck in the open position and allowing fuel to seep through the carburetor into the intake and into the cylinder. The needle may also not be seating correctly , check the float the check to make sure the needle is seated properly.


What causes no compression on a brigs and stratton 18.5 hp?

could be a broken valve. or a loose spark plug..