Hey there...gonna jump right in here (after introduction of course!) I just purchased a 1978 Yamaha xs650 and it runs fantastic, but.....there is a little gremlin inside trying to burst his way out with a mini jack hammer. I searched youtube and low and behold, there was another xs with the exact same sound. Here is a link posted below, hopefully you guys can help me narrow this one down for me. Thanks in advance!