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61 bunton is backfiring

Discussion in 'Mechanic and Repair' started by BODIDDLY, Feb 11, 2004.


    BODIDDLY LawnSite Member
    Messages: 49

    my 61 bunton rider backfires when i turn it off..only does it when its been running a while.anyone knows what could be causing this?:confused:
  2. dishboy

    dishboy LawnSite Fanatic
    from zone 6
    Messages: 5,289

    Is it idling fast when you shut it down, put a tach on it to see what your idle speed is when hot. Are all your connections on the kill switch tight and making full contact.
    Since it is doing when it is hot I suspect it is more a RPM or fuel problem rather than a electrical. If it is "dieseling" combustion is continuing when the valve is open thus the backfire. It could be other things as well I'm sure. Is it backfireing through the carb or the muffler?
  3. imograss

    imograss LawnSite Senior Member
    Messages: 796

    Idle the mower down to it's lowest setting, let it idle this way for a minute or two and then shut it off. Mosy all mowers are this way due to the crazy emissions crap.
  4. locutus

    locutus LawnSite Bronze Member
    from NC
    Messages: 1,266

    Damn Bo, 1961- thats an old azz mower. Maybe you're misinterpreting a death cough for a backfire.

    BODIDDLY LawnSite Member
    Messages: 49

    61 is not the year but the width of the mower..i slowed down the idle before i turned it off and that seems to work. the backfire comes through the muffler. thanks for the info
  6. locutus

    locutus LawnSite Bronze Member
    from NC
    Messages: 1,266

    I was kidding.:D

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