2010-13 Yamaha YZ450F
Yamaha shook things up drastically with the development of the 2010 YZ450F and its reverse-headed, rearward-incline four-stroke Single. The all-new cylinder head became the first of Yamaha’s big four-stroke motocrossers to feature a four-valve cylinder head instead of five-valver since the beginning of the model line. The engine was also fuel-injected rather than carbureted, and the powerplant was housed in an all-new bilateral beam aluminum chassis with heavy emphasis placed on mass centralization.
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