Just bought a 1979 columbia commuter, it works fine its a cool little moped only payed 460$ it has only one problem when i put the gas lever on the On position it leaks a bit of gas, it didnt do that when the guy showed it to me but noticed it when i got home, any suggetions on how to fix this, my dad suggested i put the fuel vavle in the half way position would this work? Are sachs good motors? this one seems fine other than the leak.