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Hello,

I am looking for ways to eliminate my black spark plug problem on 2/4 cyl. Everything has been changed on the carburetor.

Thanks a lot for your answers

  • Re: R912 CARB

    by » 7 months ago


    What position is the needle clip?


  • Re: R912 CARB

    by » 7 months ago


    Plugs often get black during idle.  When you did the most recent carb balance, did you check the idle-mixture setting?


  • Re: R912 CARB

    by » 7 months ago


    Dry black soot can be normal from idling. Either run the engine up at high rpm's on the ground or go fly, but shut down immediately after with no long taxi or idle time. If you play with things your not sure about you may cause issue you won't like or cost money.

    Mkae sure your plugs aren't gapped too wide which might contribute to the soot at  low rpms.

    Rob may be onto something too. If someone was in the barbs make sure the needle clip is in the #3 clip postion.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-574-1080 Home (TRY HOME FIRST)
    520-349-7056 Cell

  • Re: R912 CARB

    by » 7 months ago


    thank-you for your prompt response,

    My clips are in the standard position (2 it seems to me). Indeed, I have a lot of taxiing after landing. We're going to look at the idle screw. If I squeeze is it richer or less richer? I have a doubt...

     

    Sincerely,

    JSB


  • Re: R912 CARB

    by » 7 months ago


    Clockwise is leaner.  The standard procedure/position is to turn fully in (clockwise) then back it out (counterclockwise) one and a half turns.  

    The last time I checked mine, the screw on my 2/4 carb had somehow backed out to two full turns.


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