Dwight, you could be right on the John Britten bike. I just looked a bunch of pictures of his bike and i cannot see a radiator anywhere. Of course sport bikes have an advange over cruisers, full dressers as well, in that they are covered in body work and so it is much easier to hide unsightly plumbing and radiators. Hiding a radiator and all its plumbing anywhere on a crusier would be a challenge.
I believe the Honda concept bike you refer to is the Honda NAS (New American Sport) from 2004, which i happen to think is a stunning piece of hardware.
Honda NAS
