Typical Briggs LMS linkage on 6.75 HP Craftsman (made by AYP) lawnmower.
To set the governor: 1.) Loosen the governor shaft clamp 2.) Move governor shaft fully clockwise (viewed from above) while keeping the governor lever and carburetor linkage in the fast position as indicated by arrows. 3.) Tighten the clamp. When set correctly the linkage and lever can be moved freely from closed throttle to wide open throttle and back.
The high speed is typically set to 3600 rpm. Bending the tang clockwise increases the speed.