2013 Kawasaki KX 250F, 2013 Kawasaki® KX 250F For almost a decade, no other bike has spent more time on AMA Supercross and Motocross podiums than the Kawasaki® KX 250F. The race-proven technology of the quarter-liter motocross leader returns for 2013, with an all-new plug-and-play adjustable ECU, narrower new frame, upgraded Separate Function Fork (SFF) fork and slimmer ergonomics, so the KX 250F is poised to continue its class dominance in 2013.