Does any one know what the plastic part of the carb that has a nipple in the middle, and joins into both carbs near the top? why I'm asking is that i did the AIS block, jetting, air box removal, and exhaust. I had the whole bike apart and I don't remember what hose went there. I just left it open for now, and the bike runs fine. I think it was a over flow of some sort, but just wanted to hear from the experts.