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  • Re: Engine missing at 5500 rpm

    by » one month ago


    Ron,

    What location is the correct one for the punch mark on the choke shaft?  Is there a sketch somewhere in one of the manuals you could point me too?  Thanks for the input.

    When I reset the float arms to the right settings per the discussion above my right carb seemed fine but my left carb again began venting fuel out the vent tube, a lot.  Thats why I had tweaked the float arm in the first place to get it to stop overflowing.  There still must be something wrong in that carb float valve, which is new, or in the valve seat?  Any more ideas?


  • Re: Engine missing at 5500 rpm

    by » one month ago


    Choke shaft punch mark faces towards the air intake end or towards what looks like the molded pipe side.


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


    Thank you said by: RotaxOwner Admin

  • Re: Engine missing at 5500 rpm

    by » one month ago


    Roger Lee wrote:

    Choke shaft punch mark faces towards the air intake end or towards what looks like the molded pipe side.

    Larry,

     

    What Roger said, since he's the one that told me to check mine.

    The Heavy Maintenance Manual shows it and the videos on this web site show it in the reassembly  section.


  • Re: Engine missing at 5500 rpm

    by » one month ago


    Thanks for the insight - as a follow up I discovered what was causing the carb venting.  During my previous tweaking of the float arm position I must have inadvertently squeezed the two arms toward the center of the carb.  As a result, the arms were not riding on both float pins.  When I straightened them out everything worked fine (no venting).  We can add this finding to the long list of things that can cause fuel venting overboard.  It emphasizes to me how important it is to follow the dictates in the manuals and not to get carried away with random "tweaks".  

    My lesson learned: tweaks tend to be a bandage that may minimize the symptoms of any issue but are a very poor substitute for a relentless root cause investigation and a solid fix accordingly.  


    Thank you said by: RotaxOwner Admin

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