The governor is set by loosening the nut on the bottom of it that locks it onto the shaft that comes out of the engine block. Move the governor arm back and forth to make sure nothing is binding and then move the governor arm to the point where the carburetor is at wide open throttle, (WOT). Then with needlenose pliers or forceps, turn the governor shaft in the same direction as the governor arm so that when the arm is at WOT the shaft is turned as far as it will go in the same direction. Then tighten the nut back down. The move the arm back and forth and verify that the throttle is opening all the way and closing all the way.
It's easiest to have someone hold the arm at WOT while you turn the shaft and tighten the nut.
Let me know if this is what you need or if the engine still won't run right. Thanks, PK.