The speed control lever moves one end of one of the governor springs, stretching it slightly as the speed setting increases. The other end of the spring is indirectly connected to the throttle butterfly on the carburetor. The air vane near the flywheel fan is also connected to the throttle butterfly. Essentially, the spring tries to open the throttle and the air vane tries to close it. When the speed control is set to minimum, the air vane and spring are in equilibrium at 1750 rpm. When the speed control is set to maximum, the spring is more stretched so the air vane has to push harder, and equilibrium is reached at 3000 rpm. The spring should be stretched smoothly and evenly as the speed control moves from minimum to maximum. I'll leave it to Bruce to comment on whether that is happening in your pictures - I can't see what is happening, except that the bottom of the spring is moving from right to left as you increase the speed setting, and the upper spring looks like it might not be connected.
