What model motorcycle best fits a man 6'4 tall?

It all depends on what sort of bike you like. Me being about the about the same height i have found i cant ride a sporty type bike anymore (bad on my back) but i now ride a cruiser style bike and feel more comfortable especially with my long legs hope that has been of some help to you I am 6'4" and have owned over 60 motorcycles. The ones that fit best are.. 1) Honda Goldwings all of them from the 1975 on up. 2) Dual sports, Kawasaki KLR's Honda XL's and NX's Suuki DR's. 3) The old Honda's were bigger then the newer ones, like the 1982 CB750C or CB900C is the next best road bike to the Goldwing for room. I have a Honda XL and ST1100 in my garage today. Also a Honda 1100 ACE that I am selling because it is too cramped. Hope this helps.