The Kawasaki Ninja ZX-4RR KRT Edition Has A Tiny, Angry 400cc Four-Cylinder Engine, And We Need It - The Autopian
Rebuilding my Kawasaki ZXR 400 L9 (Part 1) : r/motorcycles
Kawasaki ZXR400 race project - DAY 8
RB Racing - A Kawasaki ZXR 400 Race engine about to come together. Omega pistons all weight matched, rods and crank balanced and blueprinted, ready for the first series of dummy assemblies
Kawasaki ZXR 400 specs, performance data - FastestLaps.com
Rumors Begin About a Four-Cylinder Kawasaki Ninja ZX-4R - Asphalt & Rubber