Just got my (new) 1972 CB 350 home yesterday and discovered it´s leaking gas. I traced it to the hose that is connected to the bottom of the left carb. The hose was not connected to anything at the other end -- is this right? Does it serve as a vent? (Excuse my newbienesss, but it´s been 30 years since I´ve worked on a bike) The fuel flow is in the off position and there isn´t leakage from the right-side hose, so is there something I can do to solve the problem? Thanks for your help... Dan