I found the the small rear coloured panels under the seat buzz. The rear plastic push type fixing buttons are a loose fit. You can fix the problem by fitting a suitably sized washer under the button head and refitting. The same problem exists with the rear buttons that fix to the petrol tank and hold the rear of the black instrument cowling. Same solution solves that as well.
It's a quick fix - both parts. Replace the plastic push-locks on the rear colored trim with small stainless cap-screws and nylock nuts.
The buzzing plastic piece over the rear taillight can be pulled apart with minimal finger pressure. Just shoot a small amount of silicone or permatex around the periphery and push it back together - the rear buzzing all goes away. It also helps keep dirt and mud out of the rear tail light section.
it's not very hard to fix at all. it first happened to me when i was doing wheelies on mine and i brought the front down a little harder than i would have liked to. anyways all you have to do is take the piece over the tail light off and put two sided tape around the contact areas. i did this and it's not longer a problem.