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Brand new 72 450 Honda.
Yes, good looking motorcycle, but as soon as the Honda 550/4 came out, I sold it and bought that. Wish I still had both of those motorcycles.
Out here a lotof the 450's were black, and got the nickname "Black Bomber".
Torsion bar valve springs I believe. Seemed to be a pretty nice bike and went pretty well.
The CB450-K0 (first version, 1965-1967) were mostly black. Those were the "Black Bombers." They also made a very few K0's, which were called the "Red Dragon." Yes, torsion bar valve springs, and valve adjustment was done by rotating the the rocker shafts, which have an eccentric on the ends where they attache to the cylinder head casing.