The 2023 Kawasaki Ninja ZX-4RR KRT Edition is an all-new small-displacement sportbike said to offer track-ready performance.

In 2018, Kawasaki distinguished itself from Honda and Yamaha by bumping displacement of its entry-level sportbike up from 300cc to 400cc with the introduction of the Ninja 400. Team Green has thrown down the gauntlet again with the 2023 Kawasaki Ninja ZX-4RR KRT Edition, a new track-focused sportbike.

Related: 2018 Kawasaki Ninja 400 ABS | First Ride Review

The 2023 Kawasaki Ninja ZX-4RR KRT Edition chassis was designed with input from the Kawasaki Racing Team (KRT) World Superbike program.

At its heart is a new liquid-cooled, DOHC 16-valve 399cc inline-Four, which adds two more cylinders than the Ninja 400?s 399cc parallel-Twin. Developed with input from Kawasaki?s Ninja ZX supersport machines, the engine has an oversquare bore and stroke of 57.0 x 39.2mm and is said to deliver impressive power and a claimed peak of 26.5 lb-ft of torque at 11,000 rpm.
The engine features fine-sand cast intake ports, large intake and exhaust valves, precision-machined combustion chambers, forged camshafts, cast-aluminum pistons, and a 12.3:1 compression ratio, yet it runs on regular unleaded fuel.

The 2023 Kawasaki Ninja ZX-4RR KRT Edition has ride modes, traction control, and adjustable suspension.

A lightweight flywheel contributes to the Four?s quick-revving nature, a large radiator contributes to efficient cooling, and a ram air duct brings cool...