Fatten the bottom 1-2 hrs. Pinch test. Time it takes to spool up indicates rich or lean and how much it spools up indicates your idle gap setting. If nothing changes I'd pull the needles and replace the o-rings. Definitely sounds like the carb if it was a fairly sudden change. Look at the front bearing too. If you break-in super rich it creates crazy crankcase pressure and it's really easy to force a premature air leak.

Iono...my .02 cents.