I've fixed a couple rattles on mine. The worst and most difficult to track down was my bar end weight. Didn't matter how tight it was, it always rattled. I ended up using a little black silicone between the weight and the handlebar and the buzz went away. Another one was the black plastic triangle underneath the windshield. I used a little weatherstripping on the underside of it to stop that buzz.
+1 here.
Bar end weights: 1,5 mm washer
Black plastic triangle: weatherstripping on the inside of the lip
...and she is as smooth as they come.