carb HELP

[2wheels]

My bike was running perfect, then It started running very Rich. I put in a new needle &seat, plus a new float. Still runs very rich. I set the float 4 times,..droping it lower each time. Still runs very rich ! It wont idle under 2500rpm or it floods out. I did a "float , needle seat Test....it stops the fuel no problem. "it almost seems like the fuel is by- passing the needle & seat" could the carb have an internal crack ?? I have cleaned the carb 4 times with carb cleaner and compressed air. Its super clean,..never did find any dirt. How come the bike runs sooo rich ??? What am I missing. 2007,250 marauder milage 4000kms.