It runs great once it is warmed up. Two contributing factors. The flapper valve in the manifold is stuck and the throttle cable doesn't work. I will see about getting them functional before doing anything ekse.
You are now on Easy Street!
Fix that throttle cable and you will be able to warm up your engine with the throttle cable out a smidgen and the choke knob all the way in as described in the Operator's Manual. No more over-rich condition.
Since it runs fine once warmed up, I'll bet the flapper valve is stuck in the closed position. That is a livable situation for now.
Eh hm, "Its never the carburetor."