Howard V,
Please note, this is NOT the perfect way to do things but, if your in a hurry!
Shut the fuel off to the carb, if the shutoff will not work. Pinch the line closed.
Without taking the carb off the tractor, and the tractor setting level, remove the fuel bowl and see if the float is level when you raise it up and LITTLE finger pressure where it stops.
If not, take a litle screw driver and adjust the float tab to make it level at it's highest point.
Reinstall bowl, turn gas back on and see what happens.
Assuming that you have a Carter/kohler carb. Turn both screws all the way in. then turn both out 1 1/2 turns, that will get it started and you should adjust both accordingly at 3/4 to full throttle.