http://parkoffka.ru/item/2006/12/27/motocikl_s_radial_nym_dvigatelemAnd then I happened across this link, which purely accidentally also found, but learned, about this... and it was photographed at the Concours d’Elegance in California, and they think it's by Jesse James http://thekneeslider.com/archives/2006/05/10/radial-engine-powered-motorcycle/
Also on radial engine bikes http://johnnyradial.com/motorcycle_photos.html
