[tubman]

Typical amateur rebuild. I would first suspect a leaking power valve. Either the wrong one that looks right but doesn't seat correctly, or a blown diaphragm. Take the top off the carb, fill the float bowl with gas, and let it sit over night. (I usually put the top back on or at least cover the bowl with aluminum foil.) If the fuel level is down significantly the next morning, you have a bad power valve.

Of course, the ultimate solution is to send it to "Charlie, ny" and have it rebuilt properly. "Sciala" on here is also good.