please help, i have a 98 fxdwg with 22,000 miles i am noticing a very bad viration when accel or decel at normal opperating speeds. if i am on the gas hard it does not do it or if i pull in the clutch is doesnt do it either. this vibration also happens when the bike is stopped (not moving) and you hold it at a steady RPM (2000-3000) range. is this a common problem? any suggestions on what this may be and what the fix may be?