Thd 2017 SR400 is a legendary classic that's a kick to ride. With retro styling and one of the best performing 399cc air cooled engines.Top FeaturesCharismatic, Torquey Engine: The SR400 is powered by a 399cc, single-cylinder, air-cooled, SOHC, 2-valve engine that produces a torquey, "thumper" engine character that makes it an absolute blast to ride. Fuel injection gives the motor fantastic response and modern practicality.