GPX 600 R

1990 Kawasaki GPX 600 R Technical Analysis & Specification Breakdown

Engineered by Kawasaki for the sport touring motorcycle segment, the 1990 Kawasaki GPX 600 R 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 85 HP (62 kW) at 11,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 143.6 HP per liter, the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.

On the scales, the GPX 600 R measures 206 kg (454 lbs) wet (curb), translating to a power-to-weight ratio of 0.41 HP/kg (2.42 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 226 km/h (140 mph).

Within MotoLibrary's Kawasaki archive, this model family spans 5 indexed model years from 1988 to 1999, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.