This carb looks like it should have a primer button of some kind where a broken off stud is. Does anyone have a photo of this or a similar carb showing the primer button?
Different model – same carburetor. On the newer models an extension on the high speed adjustment puts the knob above the fuel tank. On those, you prime the motor by pushing down the adjustment knob. The interlocking arm (shown above un-tightened) then does the pushing. . . 🙂