I'm having the exact same issue, and to boot, my Choke likes to engage itself.
I got the motor started, the throttle dances all over the place on its own, I disengage the choke, but every 30-45 seconds or so it starts to push the choke knob back out about 1/4 the way, and I have to shove it back in.
My governor must be way out of whack too because at full throttle on the lever I don't get full throttle on the carb unless I pull it on the carb by hand. When the engine is off the lever commands full range of motion though. When I rev it by hand to full it sounds like I'm wayyy over revving it.
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