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    pontiacasa's Avatar
    pontiacasa Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 26, 2008, 08:27 PM
    Back fire
    Why would my murray lawn tractor back fire through the exhaust when I shut it off?
    21boat's Avatar
    21boat Posts: 2,441, Reputation: 212
    Ultra Member
    		  
    #2

    Dec 26, 2008, 09:20 PM
    A good possibility is its running too rich. When this happens and the muffler is hot the motor still turns and no plug fire "you turned off" And the unused rich full goes into hot exhaust pipe and the piston is about stopped doesn't push any more air flow out exhaust. So unexploded fuel air mixtures hangs in the hot exhaust pipe and explodes The mower is to rich on air fuel mixture and can cause this. Dirty or worn valve seat could also cause this explode reaction. "Blow By".
    Signed 21 Boat
    Fr_Chuck's Avatar
    Fr_Chuck Posts: 81,301, Reputation: 7692
    Expert
    		  
    #3

    Dec 26, 2008, 09:42 PM

    Moved to power equipment
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #4

    Dec 26, 2008, 10:09 PM

    Does the oil smell like gas and/or is the air cleaner oily?
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #5

    Dec 27, 2008, 09:05 PM

    Hi,
    Factories say"throttle it down for 20 seconds or more before shutting it off." Gas build up in a hot muffler is the reason. Shut it off and there is no ignition to burn the fuel.
    Peace,
    Clarke
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