KTM 650 Duke Roadster Motorcycle
According to KTM's website, this is the most powerful - 65 HP (48 kW) - street-legal single of all time.
Some tech specs:
Engine: 4 stroke, 1 cylinder
Displacement: 654 cc
Transmission: 6 gears
Starter: E-Starter
Dry weight: Approx. 138.5 kg (305.4 lbs)
www.worldwidemotorcycles.com