The YFZ450R is the most technologically advanced sport ATV on the market today. It is simply the top of the line Ã¢ racingÃ¢ Â level Sport ATV. It combines a high-tech, quick-revving, titanium five-valve, 449cc fuel-injected engine with a lightweight, professional-caliber cast aluminum/steel chassis. The power/chassis combination will make for a championship-winning machine time and time again.
- Advanced Frame
The YFZ450R 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.
- Aggressive SE Style
Bodywork is designed for great ergonomics and rider comfort, with more room to hang off in the corners, and the seat shape is padded in just the right places to improve lap times. Body panels come off easily without tools for service, and a dealer-installed GYTRÃ‚Â® grab bar highlights the unique SE graphics package.
- Advanced Cylinder Head
The 449cc engine uses titanium five-valve cylinder head technology designed to deliver abundant power in the mid-range to top end, with more Ã¢ hitÃ¢ Â feeling right off idle. The higher compression ratio further improves overall engine performance.
- Fuel Injection
The YFZ450R incorporates Yamaha Fuel Injection for precise fuel delivery. With a big 42mm MikuniÃ‚Â® 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
The industryÃ¢ s first assist and slipper clutch on a Sport ATV reduces clutch lever effort by about 25% for less fatigue while at the same time increasing clutch plate pressure for positive engagement. Additionally, this new clutch system reduces the engine braking effect, which allows faster cornering, particularly when downshifting, and also allows the suspension to absorb bumps better during braking.Ã¯Â»Â¿
The fuel-injected 449cc engine has superb power characteristics. Power delivery is smooth and strong off the line with lots of midrange to top-end power.
- Compact Counterbalanced Engine
The crankcase holds a crankshaft thatÃ¢ s ready to handle the increased demands of the racer, as well as a counterbalancer to reduce vibration. The crankcase also houses the oil tank, which helps to centralize mass for unmatched handling while making maintenance easier.
- Tuned Camshafts
Camshafts have been revised to help maximize the engineÃ¢ s impressive power output from off the line all the way up to the top end.Ã¯Â»Â¿
The body configuration allows more room for the racer to move around dur