So I've rebuilt the carbs (twice) now with all new rubber bits and thoroughly cleaned the jets. The bike runs fine, but after it warms up, fuel leaks out of the #3 bowl like a faucet. It seems to be leaking from the bowl gasket but it's hard to tell. Fuel is not coming out the overflow tube, so I'm pretty sure it's not a stuck float.
When I had the carbs apart, I messed around with polishing the float bowl, could this have warped the soft metal?
Or...
After first rebuild attempt, the #3 float was stuck, so had to open it up again to smooth out the pin that holds the float in place. Is it possible that the rubber O-ring/gasket is a one time shot and should be replaced since I opened it up? When I opened it up, the O-ring would not go back in right away, it was too big to fit back in the grooves. I had to wait until the next day for it to shrink back down.
Not looking forward to pulling again, I should be able to pull the bowl with a small enough screwdriver, right?