2012 Kawasaki KX85, New 2012 KX 85 Two-Stroke - The Next Step for Future Champions With an impressive power-to-weight ratio and a compact, nimble chassis, it s no wonder that the KX85 is the bike of choice for riders getting serious about motocross competition. The 85 cc class has long been the proving ground for many of the top riders, and the KX85 has helped them gain mastery of the track.