lil bull had this same issue.....
I rode his bike and could feel the vibration in the driver pegs. I noticed it was worse on "rear braking". I rolled to about 15mph and put the bike in neutral (accelerate in first gear then shift to neutral, don't get the bike going too fast you can cause stress to the tranny "forcing" it into neutral). You just want to be rolling down the road in neutral and then once you do this apply the rear brake. If vibration worsens then you your chances of it being a wheel bearing is my suggestion. The honda shop showed me his wheel as they pulled the axle out and the balls were falling out of the wheel....
Ricky-D, as we have discussed before regarding a wheel bearing failure is problem matic on the left rear but you and I don't agree and that's okay... to each his own..
