Yamaha YZ250F 2017

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2017 Yamaha YZ250F CONQUER DIRT The fuel injected 2017 YZ250F offers excellent power and amazing cornering performance thanks to exhaustive mass centralization efforts and a compact chassis design. For '17 the engineers have made a significant number of improvements to both the engine and chassis. The YZ250F has the response and depth of power that the competition can't match! ENGINE & CHASSIS For 2017, there have been a number of significant improvements to the class leading 250cc power plant. A new cylinder head, cams, connecting rod and revised transmission top the list. On the chassis side, we have increased the exhaust port shapes Revised intake & exhaust camshafts & valve springs Revised intake tract & intake manifold New connecting rod design New crankcase heat treating process Revised 5-speed transmission, shift drum & gear shift lever Revised wrap around exhaust system header pipe Revised ECU Revised frame & engine mounts Revised front fork outer tubes & damping settings ENGINE The design goals for the fuel injected YZ250F are a balance of easy cornering, lightweight & compact feeling thanks to excellent mass centralization. The fuel injected engine features a wide, controllable power band that sets the standard in the 250 class. Revised, "reversed" liquid-cooled, 250cc, DOHC, 4-valve (titanium), single with fuel injection. The engine has been tuned for excellent "ride ability & controllability" and delivers a broad, easy to use power band with excellent power characteristics throughout the rev range. 2017 model changes improve power delivery in both low to mid and mid to top end performance. Rearward slanted, reversed cylinder design. "Reversed" engine design (FI system is front mounted, exhaust exits from rear of cylinder). Revised, 4-valve cylinder head features a 13.5:1 compression ratio. Shorter internal air box funnel & new intake manifold with larger cross section. Lightweight titanium valves & revised load optimized oval valve springs. Automatic cam chain tensioner. Revised, intake & exhaust camshafts. "liner-less" lightweight aluminum cylinder features a ceramic composite coating applied directly to the aluminum block. CHASSIS/SUSPENSION Revised, compact "Bilateral Beam" aluminum frame. Lightweight, tapered aluminum swingarm. Lightweight detachable rear sub frame. Revised, 48mm, adjustable, inverted, Kayaba "SSS" cartridge fork offers 310mm (12.2") of wheel travel. Fork features a twin-chamber, "Speed Sensitive System" design Fork features a Transfer Control Valve (TCV). Large "wrap-around" plastic fork protectors. Adjustable handlebar holders offer a total of 4 different handlebar positions with an adjustment range of 30mm. Monocross link rear suspension with 315 mm (12.4") of wheel travel. Large