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914 backfires when I shut engine off

  • ransman
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2 weeks 23 hours ago #23090 by ransman
914 backfires when I shut engine off was created by ransman
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.

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1 week 6 days ago #23109 by Bill Hertzel
Replied by Bill Hertzel on topic 914 backfires when I shut engine off
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.

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3 days 6 hours ago #23170 by N874CB
Replied by N874CB on topic 914 backfires when I shut engine off
I had that issue after wrapping the exhaust and muffler with header wrap. Removed it and back to normal.

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