My 2008 developed a speed related buzzing noise after changing the rear tire. Due to logistical issues the bike laid on its guards for three days before I could get the wheel with the new tire back on. Since then the bike makes a speed related buzzing noise. It become audible at around 25 mph loader through 40 mph then less so. Vibration at highway speeds in noticeable. Tire was balanced with dynabeads. I immediately thought I had a tire problem but can find nothing wrong and neither can dealer. Dealer claims head shake and front fork seals as the problem but I can't make the association. If it's not the tire I wonder if leaving it laid over for three days might have done something. Thoughts welcome as to what might be going on.