914 backfires when I shut engine off

by todd linkous in 912 / 914 Technical Questions 5 years ago

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 Bill Hertzel » 5 years ago

Bill Hertzel

13 1.95k 7.98k

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
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: 914 backfires when I shut engine off

by Tony Armour » 5 years ago

Tony Armour

0 17 28

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

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914 backfires when I shut engine off

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