GPX 600 R (reduced effect)

1990 Kawasaki GPX 600 R (reduced effect) Technical Analysis & Specification Breakdown

Built around Kawasaki's sport touring motorcycle platform, the 1990 Kawasaki GPX 600 R (reduced effect) pairs a 592 cc (36.1 cu in) liquid-cooled in-line four, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 50 HP (36.5 kW) at 10,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 84.5 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the GPX 600 R (reduced effect) measures 206 kg (454 lbs) wet (curb), translating to a power-to-weight ratio of 0.24 HP/kg (4.12 kg per horsepower). The 19.5-liter (5.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 183 km/h (114 mph).

Within MotoLibrary's Kawasaki archive, this model family spans 2 indexed model years from 1989 to 1990, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.