On February 1, 2023, Kawasaki officially launched the all-new Ninja ZX-4RR KRT Edition in the U.S. Is it an answer to the enthusiasts here who like to moan about all the cool, smaller-displacement bikes we don’t get? Let’s dive into the specs and see.
It’s powered by a shiny new, high-revving, four-stroke, liquid-cooled, dual overhead cam, four valve, 399cc, inline four-cylinder engine. Bore and stroke are 57.0 by 39.1 millimeters. Kawasaki’s peak torque figure for this little powerplant is 26.5 pound-feet at 11,000 rpm. Redline, by the way, is over 15,000 rpm. The compression ratio is 12.6 to one. This mill is mated to a six-speed gearbox with an assist and slipper clutch fitted as standard equipment.
