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Yamaha YZ450F 2021 Parts & Accessories

First introduced in 2003 to replace the YZ426F, the Yamaha YZ450F is Yamaha's flagship open-class four-stroke motocross motorcycle. Built for premier-class Supercross and Pro Motocross racing, the YZ450F has driven premier-class innovation across two decades, introducing an aluminum frame in 2006 and a revolutionary rearward-slanted cylinder head with a forward-positioned air intake in 2010 to centralize mass. Continually updated with modern electronics—including launch control, traction control, and smartphone ECU tuning via the Yamaha Power Tuner App—the YZ450F remains a benchmark for explosive power, precise chassis stability, and race-winning performance.

• 450 cc liquid-cooled DOHC 4-valve 4-stroke single-cylinder engine with titanium valves producing approx. 58–60 HP @ 9,500 RPM
• 44 mm Mikuni electronic fuel injection (EFI) with smartphone-tunable Yamaha Power Tuner App integration
• Aluminum bilateral beam frame chassis with lightweight detachable rear subframe
• 48 mm KYB Speed-Sensitive System (SSS) inverted coil-spring front forks with fully adjustable damping providing 310 mm (12.2 in) wheel travel
• Fully adjustable KYB rear monoshock with Link Monocross linkage providing 315 mm (12.4 in) wheel travel
• 270 mm hydraulic wave-type single front disc brake and 240 mm hydraulic wave-type single rear disc brake
• 5-speed close-ratio manual transmission with heavy-duty multi-plate wet clutch
• 21-inch front (80/100-21) and 19-inch rear (120/80-19) spoked aluminum Excel rims with Dunlop Geomax MX33 tires
• 109 kg (240 lbs) wet weight with a 6.2-litre (1.6 US gal) fuel tank capacity