It currently has a 450 cc (27 cu in) liquid-cooled single-cylinder engine.

[3] The 2005 featured a wide-ratio transmission, electric start,[4] and an 18-inch rear wheel.

[2] For the 2008 model year, the CRF450X received a steering damper, smaller fuel tank, and a revised accelerator pump.

[2] For the 2019 model year, the CRF450X was an all new design, receiving fuel injection,[2] and a new CRF450R-based motor and chassis.

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