Tractor Repair: carburetor adjustment, full throttle, screw

Question
how to adjust a 1950 b carb

Answer
Hello,

  Have the engine tuned up and at operating temperature.  Run it at idle and adjust the idle mixture screw until it idles smoothly and does not smoke.  Normally, the screw is turned out about 1 and a half turns.  Run it at full throttle and adjust the high speed screw until it runs smoothly under load and does not smoke.  Normally, the screw is turned out about 2 turns.