2016 Yamaha Yz450fx, PURE 450CC X COUNTRY RACER: Designed for closed course cross country and enduro type racing the all new YZ450FX combine light, nimble handling with the power of a 450. The YZ450F-based machine you ve been waiting for! The 2016 YZ450FX shares the YZ450F s revolutionary rearward-slanted-cylinder design, with a reversed cylinder head and forward-positioned straight intake. The YZ450FX delivers a controllable, torquey power character with strong top-end power tuned specifically for cross-country racing. A nearly identical Bilateral Beam frame that is found on the championship winning YZ450F is used on the new YZ450FX. It places the engine and fuel tank close to the center mass of the bike for extremely light and nimble handling character.