2014 Yamaha YFZ450 R, 2014 Yamaha® YFZ®450R YFZ®450R - Your Podium Awaits! The original and ultimate race-ready 450cc class sport ATV wears the AMA ATX® MX® crown and is now assembled in the USA Key Features May Include: The YFZ450R is the most technologically advanced sport ATV on the market today. It is simply the top of the line racing 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. The YFZ450R is motocross ready. The weldless frame is designed from lightweight aluminum, with a tensionsteel bottom frame that lets the engine sit lower for excellent mass centralization. All-new suspension components and settings for 2014 reduce weight while providing light, agile handling characteristics with an excellent balance of sharp handling and rider comfort. For 2014, all-new 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; there s no need to remove the battery or other components to take the fenders off. More power for 2014. The 449cc engine uses titanium five-valve cylinder head technology, with new cam profiles, and a newly designed exhaust system 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 incorporates Yamaha Fuel Injection 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. The industry 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. All-new engine settings including a new ECU and an increase in the compression ratio add power output while dramatically increasing mid-range performance. New assist and slipper clutch uses lighter clutch springs which results in a lighter clutch pull to reduce racer/rider fatigue while reducing the effect of engine braking while downshifting. New throttle body assembly and muffler shape combine to improve throttl
