I just purchased a 1972 125 and it runs fine. However, the fuel shutoff leaks like crazy. It is different from most bikes though. It is a pentagon shape with two fuel lines to the motor. I brought it to a dealer but the parts guy had never seen anything like it. It has a paper thin gasket inside. I believe this was some kind of anti spill should the bike tip over. Can anyone explain or help find a replacement. Thanx.