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My EGTs are running 1550 degrees since cold weather ( below freezing)has started. Should I step up main jet a size?

  • Re: 912 UL EGT

    by » 4 months ago


    We don't have all the info here, but you shouldn't need a new jet. First I'd check to see the slot the needle clip is in. It should be in #3  down from the top. If it's in #2 (leaner) then go to #3 (richer) clip position. If it's in the #3 position then try #4 position and then do a test run. The temp difference should be approximately 80F..


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


  • Re: 912 UL EGT

    by » 4 months ago


    hi Darryl

    The EGT in the operators manual lists max 1616 F.  This would be at your leanest operational area, normally in the 75% power range.  As Roger pointed out this is adjusted by the needle clip position and not the main jet for the most part.  Generally number 3 clip position is suitable for all weather conditions.  Be sure that you are not just getting a high resistance in the EGT sensor itself, verify that reading is accurate before chasing jet changes.

    Cheers

    38222_2_egt max limi.jpg (You do not have access to download this file.)

  • Re: 912 UL EGT

    by » 4 months ago


    Darryl...if you are unsure how to check your EGT this might help.  Found this online from Michigan Avionics. 

    Cheers

    38223_2_egt quick test.jpg (You do not have access to download this file.)

    Thank you said by: Darryl Willshire

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