CB 450? right, CB450, the "black bomber" as it was called here
This one is a K1 from 1968-69 - note the redesigned tank. The black bomber was the K0 from the a couple of years earlier.
Some seconds before and after the accident (not shown in the movie), the Honda has turned into a Ducati. I think it is a Ducati Scrambler or a Mark 3 (250, 350 or 450).
I confirm Scrambler, but capacity?