Do you have a high pitched whine that follows bike speed during coasting regardless of whether or not the clutch is engaged? If so this is not good. Check out my post Middle gear shaft breakage.
This is a problem with some 06 1100's, the nut that sets the backlash for the Middle gear shaft snaps off for no reason. (shaft is brittle). You can see the nut by removing the left hand side cover and pulling back rubber boot for driveshaft, nut is visible by the u-joint. http://www.starbikeforums.com/forums/showthread.php?t=1120&highlight=middle+gear+shaft
Hope this has not happened to your bike.