Same issue here with leaking carb in #2 Cylinder. Looks like it is coming out of the pilot air screw (on the inlet side of the carb)
I rebuilt all 4 with new seals and cannot for the life of me figure out where to look for the gas leaking through!
Also used K&L's kit to rebuild the petcock, which also, still will not hold gas from leaking through. Am I alone here about K&L's products not working?
I ultrasonic cleaned all the parts and took care with the floats to set the heights right.