In the late ‘sixties, Honda had plenty to be happy about. Within their range of small capacity twins, the CB160, CB72 and CB77 were all volume sellers, much to the delight of Honda dealers everywhere, particularly in the US.
The CB450, less so, given that the US buying public generally hated the styling, and several other things about it. Like the 250 and 305, the 450 had an oddly spaced set of ratios inside the four-speed gearbox. First was too low, second too high, which meant a struggle for acceleration up through the gears, and a neck-straining lurch when changing back to first, like at traffic lights.
For 1968, Honda decided to start with a relatively clean sheet of paper. The 450 was rejigged with an extra gear effectively slotted…