Not all Harley engines behave as paint mixers, some are very smooth, powerful and have been water cooled for over 12 years:

Attachment 5742Attachment 5743Attachment 5744Attachment 5745

That's my 2009 Harley VRSCF Muscle. It is smooth, reliable and powerful (125 HP and 86 ft/pounds of torque). It weighs less than 700lbs. It has 5 gallons of fuel and gets about 35 mpg.

My friend who is a Service Manager at St. Pete HD (Jim's) said once his dealership does not like selling them as they don't get to work on them much except for regular maintenance. I have about 18,000 trouble free miles on mine and I had it since 2011, it only had about 2000 miles when I bought it.

This way I get to ride with Harley friends as well, but mostly I enjoy both bikes. I've done as much as 500 miles per day on Muscle and over 700 per day on F6B. I feel fortunate to have both.