Duke II 640

2001 KTM Duke II 640 Technical Analysis & Specification Breakdown

Engineered by KTM for the super motard motorcycle segment, the 2001 KTM Duke II 640 pairs a 625 cc (38.1 cu in) single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 55 HP (40.1 kW) at 7,250 rpm while maximum torque reaches 58 Nm (42.8 lb-ft) at 5,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 88 HP per liter and a 1,750 rpm working window between peak torque (5,500 rpm) and peak power (7,250 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 Duke II 640 measures 145 kg (320 lbs) dry, translating to a power-to-weight ratio of 0.38 HP/kg (2.64 kg per horsepower). Rider ergonomics and chassis geometry center around a 860 mm (33.9 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,460 mm (57.5 in) wheelbase engineered for balanced agility and highway composure. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 177 km/h (110 mph).