Powering this midsized streetfighter is Kawasaki’s DOHC liquid cooled 806cc inline four. It's a familiar engine, having debuted in the 2004 Z750, itself just a sleeved-down version of the contemporary Z1000 powerplant. Now it's an 800, carrying a 2.7mm-larger bore but retaining the Z750's 50.9mm stroke. Engine feel is smooth, with little vibration at the low end and in the midrange. Get it above 8,000 rpm, though, and it starts to get buzzy. Power output is plenty to have fun, without being overwhelming—we’d love to tell you how much, but Kawasaki doesn’t say. (The last Z750 we tested, in 2005, made 100.9 hp and 51.8 pound-feet of torque; the last Suzuki GSX-S750 we had made 95.3 hp at the rear wheel.) Thanks to conventional fuel injection with mechanical throttles (not ride-by-wire), response is even and accurate, thankfully not as jumpy as the 800’s big-brother Z1000. The Z’s six-speed transmission shifts smoothly and decisively, and the torquey engine allowed me to keep it in fourth gear almost all the way up moderately fast, open mountain road.