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.

The KX450F features a number of engine refinements, including the first mass-production use of a high-performance bridged-box bottom piston that offers more power in the high and over-rev rpm ranges. Revised cam timing and ECU settings provide better mid-high rpm performance, while reinforcements to the cylinder sleeve and right side crankcase increase durability.

The race-ready engine is compact and light, with a short 100mm cylinder head and a 12.5:1 compression ratio. A wedge-shaped crank web offsets 60% of the crankshaft’s reciprocating weight, producing an effective “counterweight” effect. This is on par with Kawasaki’s factory racers and helps reduce engine vibration, smooth power delivery and enhance low-rpm throttle response. A new 40mm shorter stainless steel exhaust pipe connects to a large-volume silencer which uses long-fiber packing material to maximize service intervals. A new rubber damping collar in the rear silencer mount provides a boost to long-term durability.

The KX450F’s Digital Fuel Injection (DFI) automatically adjusts to suit track and climate conditions, and offers stable fuel-metering, even when landing from jumps in tough motocross conditions. The DFI system includes a compact and lightweight ECU, a 43 mm throttle body, a lightweight aluminum in-tank fuel pump and an ultra-fine atomizing injector. Set at a 45° angle for ideal mid-range power, the 12-hole injector sprays precise, 60-micron fuel particles for smooth power delivery and accurate engine response throughout the rpm range.