Tricky when you don't know what previous owners have been up to!
Things to check if not already done.
Choke- is it closing off fully.
Power Valve- it had a top end done.If not re-assembled correctly & operating smoothly it will give you all sorts of misleading power feed back.
Pilot circuit- Should be easy to sort that out.As Jeff suggested,back idle screw out,get it up to operating temp & play with air screw to get most responsive.If it makes no change,change pilot jet & try again.The one you have should be about right or richer.
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