In motocross, you‰Ûªve got to get instantly hooked up ‰ÛÒ both out of the gate and off the corners ‰ÛÒ and also blisteringly fast down the straights. To give riders the advantage, the redesigned 2018 RM-Z450 engine has more low-end torque, a flatter overall torque curve, faster and yet more controllable throttle response, and more peak power.
Inside the airbox, the air-filter aperture is now 30-percent larger for enhanced airflow, and an MXGP-style mudguard helps keep mud and dirt out, contributing to greater engine durability. The outlet tube leading from the airbox to the fuel-injection throttle body is also straighter, reducing intake resistance for increased power across the rev range. The throttle body is likewise revised, providing a more uniform fuel-air mixture to further increase power while providing a smoother throttle feel. Increased fuel-pump pressure strengthens the air-fuel mix for enhanced response, and the elimination of a throttle linkage further improves throttle feel.