1984 Kawasaki ZX900 Ninja ... This double-overhead-cam, 16-valve, liquid-cooled rocket pretty much rocked the motorcycle world at its introduction. Packing 113 horsepower in a lightweight chassis, the original Ninja was good for 145 mph — the fastest production bike money could buy at the time. Its launch was perfectly timed to reach all those baby boomers who started riding on a Trail 70. This year Kawasaki offers a 30th Anniversary Edition Ninja ZX-10R.