big congrats!!!!!!!!!!!!!!!!!!!!!!!1 awesome
you asked about that engine whine, a couple of posts back and all I can say is that Ive heard a bunch of xl600r and dual carb xr600 do them more than single carb or later year model xr´s dont know what it is...maybe its the fatter cam chain or something like that...
its just something that I have noticed
to me it sounds great!