Zephyr 550 (reduced effect)

1991 Kawasaki Zephyr 550 (reduced effect) Technical Analysis & Specification Breakdown

At the heart of the 1991 Kawasaki Zephyr 550 (reduced effect) custom - cruiser motorcycle, Kawasaki utilizes a 553 cc (33.7 cu in) air-cooled in-line four, four-stroke layout. In factory specification, peak output is rated at 27 HP (19.7 kW) at 7,800 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 48.8 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the Zephyr 550 (reduced effect) measures 200 kg (441 lbs) wet (curb), translating to a power-to-weight ratio of 0.14 HP/kg (7.41 kg per horsepower). The 15-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 137 km/h (85 mph).

Within MotoLibrary's Kawasaki archive, this model family spans 2 indexed model years from 1991 to 1992, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.