ZXR 400

2003 Kawasaki ZXR 400 Technical Analysis & Specification Breakdown

Built around Kawasaki's sport motorcycle platform, the 2003 Kawasaki ZXR 400 relies on a 398 cc (24.3 cu in) in-line four, four-stroke powerplant. In factory specification, peak output is rated at 65 HP (47.4 kW) at 13,000 rpm while maximum torque reaches 36.3 Nm (26.8 lb-ft) at 12,000 rpm. With a specific output of 163.3 HP per liter and a 1,000 rpm working window between peak torque (12,000 rpm) and peak power (13,000 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.

On the scales, the ZXR 400 measures 162 kg (357 lbs) dry, translating to a power-to-weight ratio of 0.4 HP/kg (2.49 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,385 mm (54.5 in) wheelbase engineered for quick, flickable steering geometry. The 16-liter (4.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's Kawasaki archive, this model family spans 5 indexed model years from 1991 to 2003, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.