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Can anyone explain why my 912 ULS has the intermittent hiccups only with an increase an rpm (added throttle) while airborne?

Occurs very intermittently. Driving me nuts!
  • Re: Engine Intermittent Hiccups

    by » 6 years ago


    Hi Eric.

    Sometimes this can be caused by a fuel tank, or bowl, vent problem.

    Alan

    Thank you said by: Eric Nakamoto

  • Re: Engine Intermittent Hiccups

    by » 6 years ago


    Grasping at a few straws here.
    Possibly a kink in the htrottle cable that causes a change after you make an adjustment? Check entire length of the throttle cable.
    Overload clutch slip in the gearbox? Needs shimming and tightening up or the over load clutch serviced?
    Sticking carb floats?
    Float armature hitting the metal side inside the carb?
    Sticky carb piston?

    Don't make this any harder I'm running out of ideas. :lol:

    Rob, Conrad or Mark. Any ideas.

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


    Thank you said by: Eric Nakamoto

  • Re: Engine Intermittent Hiccups

    by » 6 years ago


    Hi Eric

    Depending on what aircraft and where you fly, my first guess would be carb icing.

    The hiccup is when any small amounts of ice break away and are ingested by the engine.

    Cheers Mark

    Thank you said by: Eric Nakamoto

  • Re: Engine Intermittent Hiccups

    by » 6 years ago


    I just noticed my fuel block had a hair line crack! Small enough where the block is damp, but tiny drips of bubbles around block evaporate before dripping on engine. Very tiny leak. Could this cause the hiccups while airborne predominantly while a throttle increase?

  • Re: Engine Intermittent Hiccups

    by » 6 years ago


    Hi Eric,

    It could if it sucked in some air or caused some fuel starvation. No way to really tell until you replace it.

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


    Thank you said by: Eric Nakamoto

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