Another interesting tidbit:
At the Expo, Kawasaki was also there with their [then] 750cc DOHC four. They had it as a prototype, considering production in about a year, and wanted to test the potential market reception. Honda had obtained the premier site on the floor and the techs started setting up their display in the late evening, under wraps. Around midnight, one of the Kawasaki people came down from the room where they were staying with their show bike, to start their setup. He peeked under Honda's curtain: what he saw shook him up and he went back upstairs to report to the others that the CB750 was already a reality, no longer a prototype.
Kawasaki's folks immediately contacted Japan, and it was decided that they would not go head-to-head with the mighty Honda company, especially since they were a long way from production. They did not want to look like a "me, too" project, especially with just a prototype. So, they withdrew from the show altogether and returned to Japan.
The code name for the Kawi was "The New York Steak". It became the ill-fated, rushed-to-production Z1 900, just two years later. It missed being the world's first "introduced" 4 cylinder bike by 2 hours, to the Honda Four.
But then, there's a lot of things the Honda Four does better than the Kawi, even if the "Z" does have another 150cc...
