I've been noticing a couple peculiar noises on my 2007 919. Just rolled over 5k miles. Obviously it's hard to describe them because I ride a naked bike with a noisy helmet so there's quite a bit of wind noise as well. Anyway:
#1) First gear meshing. I've heard this on all my Hondas but still don't know exactly what it is. When I downshift into 1st while I'm still rolling I hear a high pitched whine as the gears mesh. What concerns me is the sound is inconsistent, like it kind of skips. Probably normal, but since I'm on the subject, I'll include it.
#2) When I go over certain bumps at low speed I hear what I can best describe as a "jingle," not a rattle, from somewhere on the rear end. Almost like dropping a small bag of coins. It doesn't do it all the time, either.
#3) A week or two ago I noticed on the highway when I rode close to a barrier I could hear a noise that sounded like a flag rustling in a stiff breeze. Today at low speed I noticed that I could hear a short "scuff" or "drag" at an interval proportional to my speed, I think from the front end. My first thought would be brake rotor, but it doesn't feel like a warped rotor at all. And, like I said, 5k miles.
When it's lighter I plan on taking a good look at my front wheel, chain and sprockets, and swingarm.
In the meantime, if anyone has any experience or ideas, I appreciate your input. Sorry for the strange descriptions.