I just purchased a 2012 Rocket III roadster with 8K miles on it. Rode it 1900 miles from where I picked it up to my home. I thought the shifting was "clunky". I owned 2 Honda Valkyries and they are so "refined" if I may say, compared to the Rocket. (My thinking on the way home). First thing I did was to change the oil. I used the recommended Castrol 10W-40 Racing oil per the manual. TOTALLY DIFFERENT SHIFTING AFTER THAT!!! Just my observation for my bike only, and anecdotal at that, but using the recommended oil made a huge difference. Hope this helps.