Hey all  new guy here from Kansas, USA. I have a 1977 Yamaha Chappy LB80 that I just found in an old barn.  I know it has been run within the past 2 years. In the process of cleaning it up I have found a hose that I am not sure where it connects into.  It looks a vacuum hose coming from the top of the oil tank.  I'll post a picture here in a little while. Thanks! Ryan