I hate to say it, but I do have to agree with Steve. The "Quietlines" now they are 30ish years old, do like to rattle a bit. I have 2 a 1450 and a 1650 and they bot rattle, but rattle in different ways. The 1450 I know the hood hinge rattles and I have not had the 1650 long enough to track it down. I will say, at the right RPM they will stop rattling. I have a bungee cord on the 1450 hood that takes most of the rattle away, however something in the seat/fender pan rattles when you are not sitting on it, haven't figured that out yet as everything back there seems tight. It is getting split in the near future for a cork gasket, maybe we will find something then. I think the 1650 rattle is in the hood or side panels. Fortunately, it quits rattling above half throttle.... we shall see. From what I have seen, the 82 series hood and sidepanels seem to be fastened a bit better, and with the different hood hinge design, the front castings don't rattle. The twin that does not vibrate like the singles do, I think helps keeping everything from loosening up. One of these days I will get all the rattles fixed.... maybe...