Here is some more history of the Honda CB72 as written by TWO writers who both owned one back in their prime! There is one account of owning a Honda 250 on the top and another at the bottom of this page. Good readin!
http://www.goodmotorcycles.com/member1/hsixhon.htm
On the same site you can also read about first hand accounts of owning/operating a Honda Black Bomber 450! My father has one on display inside his house and wow what a one of a kind machine!
http://www.goodmotorcycles.com/member1/hcb450t.htm