I had same problem Kits, my 650 lost more gas than it burned in the motor.
I got a set of 4 float valves (I presume that is what you mean by needle valves) for $46 kiwi so thats about $30 to you rich Yanks.
I doubt mine were genuine Honda parts as they came in half a folded envelope and a small deal bag ha ha.but they work and my carbs don't leak.
The great thing is on our 650's the carbs are quite servicable while still on the bike but they peed me off enough to replace the 12 wee crosshead screws with hex nuts (allen key screws) and now dropping the bowls is not a hassle.
Best of luck Kits.........oh yeah where the heck is Beavertown anyway?