2021 Yamaha YFZ450R SE
YFZ450R SE is ready for motocross. The weldless frame is designed from lightweight aluminum, with a tense steel frame that allows the engine to sit lower for exceptional mass centralization. Components and suspension settings reduce weight while providing sharp and sharp handling and driver comfort.
2021 Yamaha YFZ450R SE
The YFZ450R is the undisputed podium-topping ATV used by the world’s top racers, including six-time and current Grand National Cross Country XC1 Pro ATV champion, Walker Fowler, along with the second all-time winning, seven-time and current ATV Motocross Pro champion, Chad Wienen. The YFZ450R is the most technologically advanced sport ATV on the market today, with a quick-revving, 449cc fuel-injected engine and titanium five-valve cylinder head delivering abundant power throughout the mid-to-top end, after the YFZ’s signature massive torque-feeling right off idle. Built with pride at Yamaha’s U.S. factory in Newnan, Georgia and motocross-ready, the weldless professional-caliber frame is designed from lightweight aluminum with a tension-steel bottom frame allowing the engine to sit lower for excellent masscentralization. Suspension components and settings further reduce weight while providing light, sharp handling, and rider comfort.
The YFZ450R SE is the most technologically advanced sport ATV on the market today. It combines a high-tech, quick-revving, titanium-valved, 449cc fuel-injected engine with a lightweight, professional-caliber cast aluminum/steel chassis. The power and chassis combination makes for a championship-winning machine time and time again.
The YFZ450R SE is motocross-ready. The weldless frame is designed from lightweight aluminum with a tension-steel bottom frame that lets the engine sit lower for excellent mass centralization. Suspension components and settings reduce weight while providing light, sharp handling and rider comfort.
With more room to hang off in the corners, the bodywork is designed for great ergonomics and rider comfort. The seat shape is padded in just the right places to improve lap times while the body panels come off easily without tools for service, so there’s no need to remove the battery or other components to take the fenders off.
Advanced Cylinder Head
The 449cc engine uses titanium five-valve cylinder head technology to deliver abundant power in the mid-range to top end with more “hit” feeling right off idle. The higher compression ratio further improves overall engine performance.
The YFZ450R SE incorporates Yamaha Fuel Injection (YFI) for precise fuel delivery. With a big 42mm Mikuni® throttle body and 12-hole injector, this system provides exceptional atomization of the fuel for maximum power. The system also includes ISC (Idle Speed Control) for easy, reliable start-up and warming.
Assist and Slipper Clutch
An assist-and-slipper clutch reduces clutch lever effort for less fatigue while at the same time increasing clutch plate pressure for positive engagement. This clutch system also reduces engine braking effect for faster cornering, particularly when downshifting.
Aggressive SE Style
Aggressive styling gives the YFZ450R SE a racy customized look with extras like the GYTR® front grab bar to match its unique graphics package.
Engine Type: 449cc liquid-cooled DOHC 4-stroke; 5 titanium valves
Bore x Stroke: 95.0mm x 63.4mm
Fuel Delivery: Yamaha Fuel Injection (YFI), 42mm
Ignition: TCI: Transistor Controlled Ignition
Transmission: 5-speed; wet multiplate assist-and-slipper clutch
Final Drive: O-ring chain
Compression Ratio: 11.8:1