Wow, that is rare; never seen or even heard of one of them. So it's a 750 4stroke twin? And totally different from a stroked/bored out XS650.
I do recall Kawasaki make'in one in the late '70s.
Originally Posted by concours
What I was wheelying around on when I was 16... This is not the same one, but I got this one at an auction and restored it. Only produced for 1973 and part of 1974.