Top FeaturesInnovative Hare Scramble/GNCC® Engine Design: The YZ450FX shares the revolutionary rearward-slanted-cylinder design of the YZ450F that allows for a straight downdraft intake with a symmetrical port layout. In the YZ450FX, this engine delivers a controllable, torquey power character with strong top-end power tuned specifically for cross-country racing.Bilateral Beam Aluminum Frame: A nearly identical bilateral beam frame that is found on the championship winning YZ450F is used on the YZ450FX. It places the engine, fuel tank and exhaust close to the center mass of the bike for extremely light and nimble handling character.Advanced Fuel Injection: The YZ450F-based Keihin® 44mm throttle body fuel injection system is tuned for cross-country racing and ensures smooth throttle response and easy starting in nearly all conditions.