Dual-purpose. Engine. 249 cc four-stroke single cylinder. Transmission. 6 speed. The Kawasaki KLX250S is a dual-purpose motorcycle. In 2009, Kawasaki released their supermoto inspired KLX 250SF to the public. It is a relatively lightweight dual sport which can be used both on and off road. Its 249 cc engine has a top speed of 85 mph.