I removed my leaky petcocks from the bike this morning. I don't see any obvious reason why they were leaking, but I will pay more attention to the surfaces when reassembling. I do have a question though. When examining them, I can't really figure out how the reserve works. The "on" and "stop" positions are obvious. But when you put it in the reserve position, it appears to couple the ports in the 6 o:clock and the 9 o:clock positions together. The 6 oclock port appears to be blocked and goes nowhere. The 9 oclock port is the main feed tube from the tank. What am I missing here? I realize that petcocks arent rocket science, so I'm a bit embarrassed to be asking this.