Aggressive new bodywork makes the bike look more compact and is complemented by factory-style design and graphics.

Fuel-injected engine offers hard-hitting  power across the rev-range while ensuring stable fuel-metering in all conditions.
Changes to the intake ports, intake valves and a new offset cylinder deliver even more power.

Factory-racer-style SFF-Air TAC front fork locates its damping assembly in the left fork tube and a pneumatic spring, comprised of three pressurised air chambers, in the right. Light weight, low friction, easy adjustability, a wide setting range and precise settings are some of the advantages.

Intake ducts added below the rear of the seat contribute to improved response.

KX FI Calibration Controller, a portable handheld calibration tool, enables riders to make changes to engine maps by plugging into the ECU without needing a PC or battery. Comes equipped with seven preset map settings.

A choice of four positions allows riders to tailor their riding position. Factory-style Renthal handlebar and pad come standard.

Riders can choose from two positions to suit body size and preference. Adjustable footpeg brackets enable riders to lower their footpeg position 5 mm.

Aluminium perimeter frame is a narrower across the main beams, considerably lighter, and features revised rigidity contributing to greater front-end feel.

Weighing in at 108.7 kg, the new KX450F is over 3 kg lighter than its predecessor. The weight reduction comes care of a thorough re-evaluation of both engine and chassis components.

Lightweight ECU was designed specifically to withstand the rigors of motocross racing. ECU contains three engine maps (plus a fourth for Launch Control Mode). Settings for the three maps can be reprogrammed with the optional KX FI Calibration Kit.

Factory-style launch control system increases the chance of getting a good start by helping riders maximise traction when starting on a slippery surface. 

Oversized ø270 mm front disc delivers strong stopping power and excellent controllability. The factory-style front and rear petal brake discs also contribute to high-quality sporty looks.

Super-hard titanium coating protects the fork from wear abrasion. Self-lubricating alumite coating creates a hard, low-friction surface on the outer tube, protecting the aluminium surface and further reducing friction to promote smooth fork action.

Works-base bridged-box bottom piston (unique Kawasaki feature used for the first time on a mass-production motocrosser on the 2010 KX450F) is just one of many features inspired by our factory racers.

All-new minimalist bodywork includes even slimmer radiator shrouds thanks to re-oriented radiators, a flatter seat and tank, and smooth seamless design that make it easier for riders to move around.