With a manufacturer’s suggested retail price of $1,399, Hyosung offers only one model: the 2006 SD 50. The three-digit suffix stands for its engine displacement, which is 49 cubic centimeters (rounded up to 50 cc). The engine powering the 2006 Hyosung SD is a two-stroke air-cooled single-cylinder that generates 4.3 horsepower at 6,750 revolutions per minute (RPM) and 3.4 pound-feet of torque at 6,750 RPM. The bore and stroke of the engine is 1.62 by 1.47 inches (41 by 37.4 millimeters), and at place is a 14-millimeter Mikuni carburetor that blends fuel and air for the unit. Riders can use the convenient electric ignition or the manual kick starter for starting the motorcycle.