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How does a Rotax engine get a UL designation? Is it simply having a gear box, dual carb and dual ignition systems or are the engines built differently internally? I have a Rotax 503, Dual carb, DCDI engine with 2.58:1 "B" gear box, Motor Number 5766914, does it fall under the "UL" identification criteria or is it simply a standard snowmobile engine with a gear box bolted to it? I'd appreciate any information or insight into this. Thank you and happy flying!
  • Re: UL Engine Internal Difference???

    by » 5 years ago


    5766914 is an aircraft engine.
    I am not an 2-stroke expert but there are differences:
    Most internal parts are specific to the aircraft engine.
    Power curve is very different (snowmobile engines are NOT suitable for a propeller load)
    Dual ignition.

    Thank you said by: Adam Grengs

  • Re: UL Engine Internal Difference???

    by » 5 years ago


    As Rob points out above, the 503 is not a 'snowmobile' engine, it's a purpose built aircraft powerplant (compared to a real snowmobile engine it has different torque/power curves, etc)...

    The UL designation means that the engine does not have a type certificate, and is only for amateur/experimental 'ultralight' (etc.) aircraft use...

    From the 503 Operators Manual:

    503-OM-excerpt.png (You do not have access to download this file.)

    Thank you said by: Adam Grengs

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