YFZ450R SE Take a look at a typical ATV race track and it will be rife with the YFZ450R. That won't change for this year, because we've stepped it up again. A host of improvements, a slipper clutch and new air induction system among them, keep the YFZ450R on the top step of the podium. Race Engine Awesome power comes from a fuel-injected 449 cc, 4-stroke, 5-valve, DOHC engine, spinning optimum high RPMs. This YZ-inspired engine tuned to boost low- and midrange power for arm-straightening drive out of corners. Engine Changes to the exhaust system, cam profile, compression ratio, and throttle valve angle improve top end and response. When it comes to power, the YFZ450R is no compromise. Slipper Clutch The all-new slipper clutch greatly improves cornering performance by simplifying the deceleration process. Less engine braking improves corner entry while the easy clutch effort reduces rider fatigue. Reduced Engine Emissions And Improved Fuel Economy A new Air Induction System introduces fresh air from the air cleaner to a point at the exhaust port in order to clean the exhaust by re-burning the un-combusted [hydrocarbon] component remaining in the exhaust gas helps achieve excellent environmental performance (clears EPA/CARB LA-4 Mode emissions standards). Also, changes in the mapping of the fuel injection system (optimizing fuel injection volume during deceleration) and more help achieve approximately 10% better fuel efficiency than the 2013 model while maintaining a high level of engine performance. Fuel Injection Yamaha's Fuel Injection uses a 12-hole injector to provide exceptional atomization of the fuel for maximum combustion efficiency and power delivery. Idle Speed Control (ISC) and the large 42 mm Mikuni® throttle body delivery easy, reliable starting, and continually monitor air temperature, intake pressure, engine temperature, throttle position and more, to ensure the right fuel delivery. So fiddling with the carburetor jetting is a thing of the past, all you have left to do is focus on the ride. Lightweight Aluminum Frame The no-weld cast aluminum frame is light and strong, providing solid groundwork for the front and rear suspension systems. The wide track helps the YFZ450R achieve amazingly flat and precise cornering. Wide Arc Design The front a-arms "Wide Arc" design makes room for awesome ground clearance. The upper and lower a-arm pivot points are positioned close together to reduce the pivot angle to improve suspension control. Professional Suspension 9.8 inches of front wheel travel, controlled by 44 mm fully adjustable KYB shocks with Kashima coating, means precise handling and a smooth ride. Roomy Ergonomics Improvements have been made to allow for better rider mobility. Concave front fenders, expanded heel wells and reduced frame to knee contact make this the most fluid and comfortable 450R we've ever released.