640 Black Style

1995 Jawa 640 Black Style Technical Analysis & Specification Breakdown

Engineered by Jawa for the naked motorcycle segment, the 1995 Jawa 640 Black Style pairs a 344 cc (21 cu in) air-cooled twin, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 23.5 HP (17.2 kW) at 5,250 rpm while maximum torque reaches 31.4 Nm (23.2 lb-ft) at 4,750 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 68.3 HP per liter and a 500 rpm working window between peak torque (4,750 rpm) and peak power (5,250 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 640 Black Style measures 150 kg (331 lbs) dry, translating to a power-to-weight ratio of 0.16 HP/kg (6.38 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance.