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While cruising at 5000 RPM, after 35 minutos, the 912UL of my airplane failed during 1 or 2 seconds aproximately, a fail similar to 1 or 2 cylinder off. After it, I flew more 25 minutes, up to landing. The mags are ok, oil presure and temperature ok, coolant pressure and temperature ok, CHT ok, no EGT yet. A friend mine, with large experience, told me that many times he experienced similar problem with other engines,4 and 2 stroke, and from other brands, and he think that it can be some dirt in the carburetor. Somebody experimented something similar ?

Ricardo Urio
  • Re: 912 UL fail

    by » 11 years ago


    Hi Richardo,

    Not much info to go one, but yes it could be fuel or electrical. Fuel is the first thing I would check. Fuel is easy enough to check so that would be a good place to start. You may not find dirt in a carb bowl and sometimes you need to remove and flush the carbs. Plugs may be another easy item to look at.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: 912 UL fail

    by » 11 years ago


    Hello Roger, we found some insects in the gascolator, fuel filter was clean, but some steel filings in the carburetor float chamber. I have no idea from where are these steel filings !

    Ricardo Urio

  • Re: 912 UL fail

    by » 11 years ago


    could be a fuel pump going bad or a fuel filter.

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