2011 KAWASAKI KX450F, Fuel-injected perfection for demanding riders. The 2010 Kawasaki KX 450F provides an ideal platform for riders looking to win races. Its precise aluminum frame, premium suspension components, and expert-tuned settings are designed to deliver superb high-speed stability, enabling racers to capitalize on its amazing engine performance. Holeshot acceleration is delivered by a strong powerband and optimized chassis geometry specifically engineered to maximize rear wheel traction. Monster Energy. Kawasaki rider Ryan Villopoto used his new KX450F to win several AMA Supercross and Motocross races, during his first year on a 450.