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Rotax 912UL black intake

in 912 / 914 Technical Questions 8 years ago
Hi. It's normal?
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  • Re: Rotax 912UL black intake

    by » 8 years ago

    Howdy,

    Can you be a little more specific and exactly what we're looking at? I think I know I just want to be sure.

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

      
    Report

  • Re: Rotax 912UL black intake

    by » 8 years ago

    I mean this black contamination inside.
      
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  • Re: Rotax 912UL black intake

    by » 8 years ago

    The Black Intake Port on a 912UL we understand.

    Does the Black "Stuff" wipe off if you rub your finger on it?
    How many hours has it been run?
    Engine always been running smoothly?
    Is your Air filter Black Also?
    Desert, Mountains, Jungle, or Sea Shore area?

    The Devil is in the Details.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: Rotax 912UL black intake

    by » 8 years ago

    Problem is that I don't know history of this engine. I just got it and replacing tubes, overhauling carburetors etc.
    Engine was running rough, I hope problem will be gone with new carburetors, re-adjusted gap in pickup coils etc.
    This contamination is black, dry and don't want to go out by finger. I'll try some chemistry later.
      
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  • Re: Rotax 912UL black intake

    by » 8 years ago

    It isn't normal and several things can cause it. Top three things that can cause this are Carbs need rebuilding, air filter dirty or too restrictive, mixture screw on the carbs not set correctly and possibly a leaking valve. Do a differential compression test.

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

      
    Report
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