2010 Yamaha YZ450F: reverse cylinder, no battery

By reversing the cylinder on the 2010 Yamaha YZ450F, inertial mass is centralized and the intake track is straightened. That means more power and better handling. Additionally, the cylinder is offset so the connecting rod is vertical when the force of combustion is at its greatest, minimizing piston/cylinder friction. That means better response. The smaller, 1.6-gallon tank is now located under the seat, for a lower center of gravity. Like we told you in June when the technical diagram leaked, the YZ450F has received its most thorough redesign since Yamaha first went four-stroke in 1998.
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