GPZ 500 S (reduced effect)

1990 Kawasaki GPZ 500 S (reduced effect) Technical Analysis & Specification Breakdown

Built around Kawasaki's sport touring motorcycle platform, the 1990 Kawasaki GPZ 500 S (reduced effect) utilizes a 499 cc (30.5 cu in) liquid-cooled twin, four-stroke layout. In factory specification, peak output is rated at 50 HP (36.5 kW) at 9,300 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 100.2 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the GPZ 500 S (reduced effect) measures 196 kg (432 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.92 kg per horsepower). The 18-liter (4.8 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 189 km/h (117 mph).

Within MotoLibrary's Kawasaki archive, this model family spans 6 indexed model years from 1987 to 1992, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.