A friend of mine just got a 2009 1200 custom XL (3000 miles) and it has excessive vibration at lower rpm in each gear when excellerating and smooths out as rpm increases. Yes Harley's vibrate, but this shakes the mirrors loose. Its felt in the frame back bone and riser. This is not a speed issue, it is related to rpm's. Has anyone with a simular bike and year had the same issue or have any idea as to the causes of the vibration, Thanks.