2017 Honda® CRF450R,

The 2017 Honda CRF450R has an all-new engine package that still incorporates the Uni Cam design, but now has a new downdraft intake layout to improve air charging efficiency, a new combustion chamber with a higher compression piston, decreased valve angle, use of a finger rocker arm to get increased valve lift, updated coils on valve springs have oval cross-sections to try and achieve a lower engine temperature, a new port layout with straighter airflow for increased efficiency, DLC on piston pin and rocker arm to combat friction, a more compact dual muffler design with more gradual pipe bends for a smoother exhaust flow, a shallower clutch assembly with fewer, thicker plates for narrower engine width, and an electric start is available as an accessory (and the kickstarter can remain in place as well).