2013 Ktm 50 SX, SXS! factory demo! - A real KTM for the smallest of future MX champions. The 87.7 lbs. (40 kg), lightweight 2013 KTM 50 SX sets standards in terms controllability and racing fun. It has everything including a high-quality chassis with easily applied disc brakes, top-quality components wherever you look, a powerful, reliable engine with easy-to-operate centrifugal clutch.