fuel mixture screw

  1. R

    Need a proper O-ring size for the fuel mixture screw on a BS38 79' Carb

    Anybody had to order new O-rings for their BS38 carb mixture screws and had them fit? Mikes doesn't guarantee sizing and mine were wrong. They sent me rings with an outer diameter of 6.5 mm and it's too big. I'm thinking I need more like 6mm. Anyone have specs for the original size and maybe...
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