Hi gang, I'm about a week into owning a '98 ST1100 non ABS. Love the bike so far (500 miles of great rides), but I feel/hear a slight rattle at (exactly) 3000 RPMs - most noticeably in 1st, 2nd, and 3rd gear. Above that there's enough other noise going on that I don't really hear it. My first guess was that it's an exhaust heat-shield rattle. PO says he didn't notice it (they never do), but suspects it could be a vibration on the drive shaft. Thoughts? TIA