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Thread: Engine Popping

  1. #1

    Join Date
    Apr 2012
    Posts
    3
    Location
    Mississippi
    Mower
    Craftsman

    Engine Popping

    I have a 2 year old Craftsman mower with a 21 HP Briggs & Stratton Engine, it has been running fine but last week in the iddle of mowing it suddenly started popping. Engine will run but it just pop pop pop, can't choke it or it will go dead. Idling but popping, I have replaced all gas, inline gas filter and new spark plu....any ideas??

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  3. #2
    SONOFADOCKER's Avatar
    Join Date
    Jun 2011
    Posts
    400
    Location
    New Jersey
    Mower
    TORO,JACOBSEN,CRAFTSMAN

    Your valves are not seating correctly . Fuel is being ignited before the exhaust valve is seated .

  4. #3

    Join Date
    Apr 2012
    Posts
    3
    Location
    Mississippi
    Mower
    Craftsman

    Re: Engine Popping

    Quote Originally Posted by SONOFADOCKER View Post
    Your valves are not seating correctly . Fuel is being ignited before the exhaust valve is seated .
    What would cause that, it is 2 years old and has been running fine

  5. #4
    SONOFADOCKER's Avatar
    Join Date
    Jun 2011
    Posts
    400
    Location
    New Jersey
    Mower
    TORO,JACOBSEN,CRAFTSMAN

    We get new machines with 10 hours that do the same thing. Things need to put together by hand, not robots at the factory ....

  6. #5

    Join Date
    Apr 2012
    Posts
    3
    Location
    Mississippi
    Mower
    Craftsman

    Re: Engine Popping

    Quote Originally Posted by SONOFADOCKER View Post
    We get new machines with 10 hours that do the same thing. Things need to put together by hand, not robots at the factory ....
    Is there a simple fix?

  7. #6
    SONOFADOCKER's Avatar
    Join Date
    Jun 2011
    Posts
    400
    Location
    New Jersey
    Mower
    TORO,JACOBSEN,CRAFTSMAN

    Everything is easy to reach . Take pics . Remove the valve cover and take the spark plug out . See what movement you have with the valves as you rotate the engine by hand . The parts are not expensive . You can find the same type repair on you tube .

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