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Having six speeds in the CRF450X’s transmission compared to an MX bike’s typical five gives you more choice, and makes this versatile bike even more versatile. You have a gear for everything from east-coast rock crawling to wide-open Baja blasts.
An electric start system ensures trouble-free starting in all conditions. The electric starter also drives the clutch side of the crankshaft, which provides superior lubrication to starter gears while allowing a narrow engine with a short, strong crank.
The CRF450X's Unicam® cylinder heads combine 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.
The CRF450X uses a twin-spar aluminum chassis that takes advantage of all the lessons we’ve learned on the MX track and from winning countless Bajas. The frame is both light and stiff, and provides the basis for the CRF450X’s excellent handling. The chassis is also wider than the standard MX frame to accommodate the six-speed transmission.
449cc liquid-cooled single-cylinder four-stroke
96.0mm x 62.1mm
Unicam® SOHC, four-valves per cylinder
Programmed Fuel Injection (PGM-FI), 46mm downdraft throttle body
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