I have a new 914ul and every time I go to shut off it backfires I shut off one mag at a time. Idle speed is around 1500. Any help would be appreciated.
  • Re: 914 backfires when I shut engine off

    by » 4 months ago


    Backfire = Fuel burning Backwards and out the Carburettor.
    Misfire/Afterfire = Fuel ignited in the Exhaust and exiting out the tailpipe.

    If it is in the exhaust, as the engine spins down, it is still drawing fuel.
    If you have a hot spot in the muffler this fuel can be ignited.
    It might resolve itself as the hot spot is eroded over time.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    whertzel1@yahoo.com
    Clicking the "Thank You" is appreciated by all.

  • Re: 914 backfires when I shut engine off

    by » 3 months ago


    I had that issue after wrapping the exhaust and muffler with header wrap. Removed it and back to normal.

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