GPZ 550 (reduced effect)

1987 Kawasaki GPZ 550 (reduced effect) Technical Analysis & Specification Breakdown

Positioned in Kawasaki's sport touring motorcycle lineup, the 1987 Kawasaki GPZ 550 (reduced effect) features a 553 cc (33.7 cu in) air-cooled in-line four, four-stroke configuration. In factory specification, peak output is rated at 50 HP (36.5 kW) at 8,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 90.4 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 GPZ 550 (reduced effect) measures 209 kg (461 lbs) wet (curb), translating to a power-to-weight ratio of 0.24 HP/kg (4.18 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 176 km/h (109 mph).

Within MotoLibrary's Kawasaki archive, this model family spans 7 indexed model years from 1984 to 1990, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.