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Engine stalls when clutch/brake pedal is released

I have a murray riding mower about 8 or 9 years old with a 12.5 hp briggs&stratton motor. the motor stalls when the clutch/brake pedal is released, whether it is in neutral or in gear. it also stalls when the blade lever is engaged.

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Under the seat, there is a operator presence switch, if this switch fails, the mower will shut off when the brake is released, or put in any gear.

Posted on Apr 23, 2009

  • GetMowing Aug 28, 2010

    Under the seat is a safety switch that shuts the mower off when you leave the seat.
    it has most likely popped loose from the seat.
    Reinsert it or replace it if its bad.

    To bypass the safety feature completely :
    1)_Either splice the wires on the switch to keep them permanently crossed.(Recommended)
    This allows my son to mow. ( he doesn't weigh enough to trigger the seat censor.)


    2)_Smear superglue around the switches button, wait about 30 seconds and the press the button in to permanently keep it pressed.

    Both of these solutions will keep the mower running even in you get off the seat.

    Note: you can do the same for the reverse button. if you are tired of holding it in to go backwards.


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Posted on May 29, 2009


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SOURCE: gas coming out of exhaust is it the carburetor and why

carb. float stuck open
Need to remove carb. replace float needle valve and possibly the needle valve seat,
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Posted on May 25, 2009

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SOURCE: Snapper Briggs and Stratton riding mower

It's mounted in an enclosure directly over the carburator.

Posted on Sep 22, 2009

  • 1 Answer

SOURCE: murray riding mower 12.5 hp briggs & stratton

Where could I buy a new gas tank for my Murray 12.5 riding mower? Has a Briggs & Stratton Engine?

Posted on Apr 07, 2010

  • 3911 Answers

SOURCE: i have a 1998 briggs

here is what you do. remove one spark plug and start it up. if it runs reinstall it and remove the other plug and start it up. if it runs on one plug, but not the other, you have a set of bent valve push rods and you are actually running on one cylinder which causes that stalling and no power even though it sounds good. push rods are cheap and easy to replace, but you should leave the fine adjustment to someone who knows what they are doing, and do both sides. common B&S problem.

Posted on Mar 21, 2011

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