250sx carb /fuel problem
 

I have a 1986 250sx the problem i'm having is that one day fuel just starting coming out of over flow tube at bottom of carb . i figured the needle got stuck due to rust or dirt from tank . took carb apart and sure enough there was some stuff in the there , so i figured while i was in there i decided to replace float and needle with honda oem parts , after doing this i still have same issue , have no idea what could be causing this ,this has lots of rubber vent lines? could this be the issue. HELP