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Excessive Mag drop during Runup

in 912 / 914 Technical Questions 11 years ago

  • Re: Excessive Mag drop during Runup

    by » 11 years ago

    Hi Jan

    If you have used compressed air to blow out your carb, you may have dislodged or damaged the diaphragm.

    I would remove the top cover of the carb and check and re-seat the diaphragm.

    I think this may solve your problem if you didn't alter anything else while you were cleaning the carbs.

    Cheers Mark.
      
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  • Re: Excessive Mag drop during Runup

    by » 11 years ago

    Hi Mark.

    Thanks. You may well be right. I will do the check asap and report back. This may take a week or 2.

    BR Jan
      
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  • Re: Excessive Mag drop during Runup

    by » 11 years ago

    Hi Mark,

    You brought up a really good point for everyone.
    DO NOT blow compressed air through the carbs and or any carb orifice with the diaphragm in place. Save the compressed air for when you strip the carbs and or rebuild them. The diaphragm is pretty durable, but you could tear it with a shot of compressed air.

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

      
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  • Re: Excessive Mag drop during Runup

    by » 11 years ago

    Thanks Roger

    I speak from experience as I did it to mine last year. It ran like a pig until I realised what I had done. It hadn't damaged the diaphragm, it was just dislodged.

    After I removed and refitted them, they were fine.

    Mark.
      
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  • Re: Excessive Mag drop during Runup

    by » 11 years ago

    While we wait to see if this works out, does anyone know how I can identify if my needle setting needs to be changed to run a lower fuel mixture? I just moved my plane from flying at 1,400ft to a new airfield at 6,070ft. It is on a Rans S12 and it does not have EGT to determine if it is running too cold.

    Thanks in adavance.

    Fredy
      
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