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Rich mixture

in General Tech Discussion 7 years ago
I have a 921 uls 400 hrs the engine was running rich when i purchased the plane i did 5yr rubber, rebuilt carbs metering rod set 2nd notch from bottom, new fuel pump, replaced radiator, installed soft start ugn. Lifter test ok, the plane is at sea level . After running engine i duscovered cyl 1,2,3 were still rich # 4 was running normal can bad coils be causing the problem?
Thanks Steve

  • Re: Rich mixture

    by » 7 years ago

    Hi Steve,
    Why do you think they are rich? Did you look at your plugs after idling?

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

      
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  • Re: Rich mixture

    by » 7 years ago

    checked after 5 min of run up at 3500 rpm and after 3 hr flight further investigation it seems plugs will show a rich mixture unless the engine can be shutoff at cruse rpm good for dead stick practice. Guess i will leave it alone.
    Thanks Steve
      
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