Fuel screw and air screw initial setting

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  • sarathchandars
    Forum Apprentice
    • Nov 2024
    • 41
    • Redmond, WA

    #1

    Fuel screw and air screw initial setting

    Does anyone have a good start point for where I should start with fuel screw and air screw as I rebuild the carbs for my '79 GS850G with the Mikuni VM26 carbs. How many turns out to start?
  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35787
    • Torrance, CA

    #2
    Pilot fuel = 3/4 - 7/8 of one turn
    Pilot air = 1-1/2 turns

    Be very careful when bottoming out the fuel screws, because the tip can wedge into the hole in the carb body, then the tip breaks off.
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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    • sarathchandars
      Forum Apprentice
      • Nov 2024
      • 41
      • Redmond, WA

      #3
      Thanks Ed. Already know this can happen, because the previous owner had done it and left about 2mm in the orifice of one of the cylinders

      Just to clarify, pilot air is 1.5 turns? and fuel is 0.75 to 0.88 turns? I feel more comfortable with decimals.

      Thanks!

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