A friend of mine has a 2011 Fat Boy. He was telling me that his bike vibrates a lot less because it has a twin cam. Well I was looking and mine is also a twin cam. So.... What else would cause his to vibrate so much less?

 

His Fat Boy has a 96B engine - softail twin cam engines have a counterbalancer which makes them vibrate less at idle. Probably somewhat more vibs at highway speeds tho.

http://en.wikipedia.org/wiki/Softail#Engines

You can go here: http://www.harley-davidson.com/en_US...html#/features

Then click on "Iconic Engine"