Honda’s Unicam cylinder head combines the best of single- and double-overhead-cam designs. The configuration contributes to a compact engine that saves weight over a comparable dual-overhead-camshaft motor and also permits a narrow included valve angle. This flattens the combustion chamber to facilitate ignition flame propagation, allowing a high compression ratio. Since less space is taken up in the cylinder head, the camshaft sits lower in the head for a more compact engine and a lower center of gravity.
Lightweight titanium intake valves cut down on reciprocating mass and permit the use of smaller valve springs, reducing overall engine height.
The CRF450R-S features a downdraft intake tract and FI body to help increase both power and fuel-metering precision. It’s part of the reason the CRF450R-S offers such explosive power and massive torque, especially out of the starting gate and in the critical first 100 feet of the race to the first turn.
The CRF450R-S’s fuel-injection system sprays twice per intake cycle. That helps increase fuel atomization without adding the weight or complexity of a second injector. The better fuel atomization means more power in the midrange and on overrev—you’ll feel it the first time you race.
Developed using Dunlop’s “block-on-block” design technology, the CRF450R-S’s MX3S tires give excellent feedback and are a perfect complement to the CRF450R-S’s frame and suspension.
The CRF450R-S uses our finger-follower rocker design. The Unicam cylinder head remains one of the most efficient in the MX world, giving you the design and performance of a double-overhead-cam layout but the compactness of a single-overhead-cam design.
The CRF450R-S features a refined squish area that helps boost compression to an impressive 13.5:1. That means improved combustion efficiency for more power.
With all the time you’ll be spending in victory circle, you need to look your best. The 2022 CRF450R-S has you covered. Our “in mold” graphics look great, and stay looking good.
A factory skid plate is light and offers the engine and lower-frame protection that a racer demands.