Hey just purchased a 83 R80RT with 23K on it. First BMW and I love the ride. I was wondering are these Airheads suppose to be so vibrationish. It seems to vibrate at slow speeds .At high speeds it's smooth as glass. The idle is up at about 1100rpm. I think that is normal for the bike. I'm not familar with these bikes so I don't know. I was told that they are a little on the rough side.