Carb symptoms

[Peter J]

Hey Guys,
I swapped my Zenith for a "rebuilt" Tillly just to see if I could use it as a spare. Upon startup, it runs rough, requires the GAV backed WAY out (5-7 turns), backfires out the exaust and seems seems to be getting real hot. I didn't check the float level very closely. I couldn't find much directly addressing this in the old threads.
What say Ye?
Thanks as always for your input,
Pete