OHH series engines
The top image is a zoomed out shot of the lower image. In these images, you see how the governor spring (arrow) connects to the governed idle link. The idle link is connected to the governor spring via the loop in the governor spring. This setup is the same if the engine is on a gokart, pump, generator, pressure washer, etc. The only variation is how the throttle lever pulls on the governor spring. This specific engine is setup for a pressure washer, where the remove throttle control is behind the engine. On engines with onboard throttle control, the control slider will be located in place of the silver cover, as seen in this picture. On gokart applications, the throttle cable will be connected from the front of the engine.
HM series engines
This is a close up of the throttle control bracket. On these engines, the governor spring is built into the control arm (thing with the governor links in it). Top no load RPM is controled by the slot head screws. Tighten the screw to increase RPMs and loosen to reduce RPMs. The link in the top hole goes to the throttle shaft and the link towards the bottom goes to the governor arm.
The above picture is the top view of the governor arm. To adjust the governor, loosen the screw and turn the arm clockwise. Then turn the clip (darker in color) clockwise also and tighten the screw.
Above are images of a Tecumseh Small Frame series engines. All HS engines have and maybe some H engines have the governor arm on the side of the engine like this. The screw on the governor control bracket above is the highspeed Top No Load screw. Use this to adjust the Top No Load RPM. The governor clip is located in the diamond. To adjust the governor, loosen this screw and push the governor arm to the right and turn the governor clip clockwise and tighten the screw back.
The arrow points to the kill switch. A throttle cable can be connected to this control bracket for remote control.