The Yamaha SR400 (2017), a legendary classic, is powered by a 399cc, single-cylinder, two valves, air-cooled, SOHC engine that churns out 27.4 NM of torque at 3000 rpm and which produces a 23 bhp of power at 6,500 rpm. Top speed: 80 mph (129 km/h). Yamaha SR400 Price Starting at $5,999 in the USA (INR 3,75,000 in India).