Clarkp,
Thanks for your reply but I said that the fuel was leaking out of the float bowl spigot and not the side vents.
I have looked at your links and I can only find one references to the float bowl spigot (unless I've missed something which is possible/probable as there is rather a lot on this subject). Which suggests connecting it to one of the vent spigots.
I live in the south of England where in winter the bikes are subjected to vast amounts of mud and weekly wash downs. I fitted the pipe as I was concerned that it was vulnerable to ingress of dirt on wash down. Initially I presumed that the original one had just fallen off. It wasn't till I'd looked at a few dozen others that I realised that 04/05 didn't have them fitted.
A friend of mine with an 03 has now removed his, fitted as standard tube, and cured his problem.
My 04 carb float settings have not been adjusted since new but is very close to the adjustments shown in one of your links and not like the, parallel to carb body, setting shown in the handbook.
Also with the tube fitted and the tap off when I used an air line to remove dust from around the carb area the carb emptied its entire contents out of this tube. Obviously due to the perfume spray effect and then the siphoning effect once the fuel had started to flow. I presume that with no tube connected the spigot does not hold enough fuel to create a siphoning effect.
I'm sure Clarkp you will tell me that its all been said before but if it helps anyone at all then I think it's worth it.