Look in the gas tank, see if it looks like shit in there or there is a bunch of rust, rusty crap coming down the line can plug several different places/things up along the way, you may have several places to clean.
Mostly check to MAKE SURE you didn't leave leaky spots anywhere when you took your carb apart and reassembled it. Intakes are famous for leaking and so will carb top covers. get your bike idling and spray carb cleaner in tiny spurts at the carb and cylinder where surfaces meet. (close up as to not suck any back in the air filter). If the bike kills or lags or runs faster or whatever, different, the carb/joint leaks.