I have an 09 Street Glide. After the bike warms up, around 3000 rpm I fee a vibration in the floorboards. Stuck a jack under the engine to see if the mounts were bad, don't think so. If I am riding in 5th gear, at say 2500 rpm, and I pull the clutch in slightly to raise the engine rpm to 3000 it vibrates. If the engine is out of gear or if the clutch is all the way in, it does not vibrate. Any ideas?