Most people will say the Honda CB750 was the first true superbike. But a few will point to the Kawasaki Z1 Series 900 of 1972. The four-cylinder, DOHC ‘Zed’ could hit 120 mph, and if you’ve got one in your garage today, it’ll be worth several times what you paid for it. The bike you’re looking at is not from a period publicity shot, but a machine currently in Australia: it’s one of the last of the series, and the result of a ground-up restoration by photographer Stuart Bowey and a friend in 2008. It's technically a Z900 because in