Z 900

1975 Kawasaki Z 900 Technical Analysis & Specification Breakdown

Engineered by Kawasaki for the classic motorcycle segment, the 1975 Kawasaki Z 900 relies on a 903 cc (55.1 cu in) air-cooled in-line four, four-stroke powerplant. In factory specification, peak output is rated at 81 HP (59.1 kW) at 8,000 rpm while maximum torque reaches 73.5 Nm (54.2 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 89.7 HP per liter and a 1,000 rpm working window between peak torque (7,000 rpm) and peak power (8,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the Z 900 measures 256 kg (564 lbs) wet (curb), translating to a power-to-weight ratio of 0.32 HP/kg (3.16 kg per horsepower). Rider ergonomics and chassis geometry center around a 813 mm (32 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,500 mm (59.1 in) wheelbase engineered for balanced agility and highway composure. The 18-liter (4.8 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 217 km/h (135 mph).