Classic symptom of a float valve not sealing. I have had such bad luck with any float valve needle that isn't oem honda that I won't accept anything but. Your problem could be a sticky float, a little dirt in the seat, or you mismatched a valve & seat so it won't seal. Try cleaning again, maybe polish the seat a little with some metal polish on a q-tip. While you're in there, make sure the float moves freely, and spring-loaded plunger on top of the float needle moves freely. The float level setting is probably ok unless you "fixed" it. My '83 did that to me when I fired it up after being stored since last march, so I shut it down, wiped up the gas and tried again till it worked right. I figured that would work because the needles and seats were new oem ($40.00 each) two years ago and they can stick some after storage.
If your gas tank is rusty, or your fuel filter is missing, it only takes a little spec of dirt to hold a valve open.
Last tip is learning to bench-test floats with the clear tube method. You can watch as fuel rises in the bowls and stops rising in the tube when it shuts off...or rises slowly to overflow when a needle won't seat.
