250 S 1 Mach I

1973 Kawasaki 250 S 1 Mach I Technical Analysis & Specification Breakdown

Positioned in Kawasaki's naked motorcycle lineup, the 1973 Kawasaki 250 S 1 Mach I features a 249 cc (15.2 cu in) air-cooled in-line three, two-stroke configuration. In factory specification, peak output is rated at 28 HP (20.4 kW) at 8,000 rpm while maximum torque reaches 24.8 Nm (18.3 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 112.4 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 reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the 250 S 1 Mach I measures 150 kg (331 lbs) wet (curb), translating to a power-to-weight ratio of 0.19 HP/kg (5.36 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,585 mm (62.4 in) wheelbase engineered for planted straight-line stability. The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 150 km/h (93 mph).

Within MotoLibrary's Kawasaki archive, this model family spans 3 indexed model years from 1972 to 1974, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.