The fuel injected engine is compact and light. The factory-style forged piston has a revised profile with a shorter skirt, reinforced external ribs and the first mass-production use of a bridged-boxed bottom with fully-flushed internal bracing so it's lighter and stronger.

The slim aluminium perimeter frame is a lightweight construction composed of forged, extruded and cast parts. The result? A strong frame capable of podium achieving success.

Revised fork spring rates and damping settings and the less rigid steering stem offer improved action and increased comfort. Diamond-Like Carbon coating reduces sliding friction for improved fork action, especially during cornering. Kashima Coat and high-precision machining further reduse friction. 

Front and rear petal disc brakes provide strong, controlled stopping power along with excellent feedback and feel. Their petal-shape design helps reduce unsprung weight and keep the brake pads clean from mud and debris for more efficient braking performance.

Bodywork components and the new seat are designed to offer riders a slim, natural riding position making it even easier for racers to go fast. The slimmer shroud design and revised exhaust pipe line contributes to improved ergonomics.

Firmer urethane helps the seat maintain its original shape longer plus the new colour scheme looks like it's straight from the factory.

An aggressive new look is evident in the sleek new bodywork styling featuring one-piece dual injected, two-tone green and white plastic shrouds and side number plates.  This new bodywork translates into less time hassling with backgrounds and graphics and more time collecting trophies.

The frame echoes the slim profile at the top, but widens at the lower end by the ankles to provide the rider with better feel and control. Completing the rider interface improvements are wide 50mm footpegs that offer sensational grip and a comfortable platform!

Factory-inspired refinements contribute to increased high-rpm and over-rev performance. Used for the first time in a mass-production machine, a new high-performance piston with bridged-box bottom features the same design as our factory racers.

The 2010 KX450F features linkage mounts below the swingarm for even more precise suspension tuning. The revised linkage ratios also contribute to increased rear wheel traction.