29-08-13, 03:35 PM
On my bike it's the Choke Bar that that sits across the carbs and the choke cable pulls to slide the choke into position. This rattles at around that rev and gives a metallic (annoying) rattle.
You'll probably find lots of people will chip in with rattles and buzzes - i'd advise wearing earplugs and voila ! the problem is cured.