I want to do a serious payback for a good friend that deserves it but I am completely stumped. He has a 2001 XT225 Serow that the carb has been touched by too many people. I am quite a capable bike mechanic, so I downloaded a service manual, disassembed cleaned the entire carb and set everything at factory settings.The bike starts right up no problem but after a minute or so it starts to leak gas out the overflow on the bottom of the carb. The float is set correctly and the needle and seat are fine. I replaced the petcock only too have the same problem. The only thing I find odd is that if you look at the right side of the carb, while sitting on the bike, there is a brass"L" shaped line out of the carb pointing downward that goes nowhere. The carb numbers say this is a California model carb but there is no canister for it to go to. Can this make the difference in the fuel leaking?