The Kawasaki Ninja ZX-4RR is a genuine rarity in modern motorcycling, a full supersport built around a screaming 399cc in-line four in a capacity class otherwise dominated by twins and singles. It draws directly on the styling and engineering philosophy of the flagship ZX-10R, shrunk down to a size and a 1,990mm overall length that suits a far wider range of riders and licences.
That compact four, with DOHC 16-valve heads, a 57 by 39.1mm bore and stroke, a high 12.3:1 compression ratio and dual fuel injection through 34mm throttle bodies, produces 57kW (77PS) at a heady 14,500rpm and 39Nm of torque at 13,000rpm through a six-speed gearbox and wet multi-disc clutch. It revs with real urgency and rewards riders who keep it spinning hard, with digital ignition and wet sump lubrication supporting a soundtrack and top-end rush unlike anything else at this capacity or price point. Four cylinders in this capacity are a rarity for good reason, needing far more intricate engineering than an equivalent twin, but the pay-off is a smoother, freer-revving character and a top end that a twin simply cannot replicate.
At 189kg, the ZX-4RR stays light and flickable, running a 37mm inverted SFF-BP fork with adjustable spring preload and 120mm of travel, and a Horizontal Back-link BFRC lite rear shock with a piggyback reservoir and 124mm of travel, with an 800mm seat height and 135mm of ground clearance that keep it approachable for smaller and newer riders as well as experienced ones. Dual semi-floating 290mm discs with radial-mount monobloc calipers provide the stopping power through 120-section front and 160-section rear tyres, and a 15 litre tank keeps fuel stops sensible.
A dual Ram Air intake system, developed using feedback from the flagship Ninja H2, feeds the engine for consistent, repeatable performance as speed builds, while sharp ZX-10R-inspired bodywork completes the supersport image. It suits riders who want proper four-cylinder theatre and a genuine high-revving soundtrack in a compact, nimble, everyday-usable package, one that feels every bit as satisfying threading through town as it does chasing the redline on a favourite road. Available now at GT Motorcycles, your Kawasaki dealer in Plymouth, serving riders across Devon and Cornwall, with finance and test rides available.
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