As promised, Yamaha has today made public the photos and information of the reverse-cylinder 2010 YZ450F motocross model, the one about which the motorcycle press has speculated so much over the summer. And reasons to speculate were more than plenty. To begin with, this is the first modern dirt bike to feature a reversed cylinder, a construction method that centralizes inertial mass and strengthens the intake track in order for the engine to develop more power and the bike to handle sweeter overall. Also, better throttle response is achieved because the cylinder is offset, meaning that the connecting rod is vertical when everything goes bang in the cylinder. This also reduces the friction between the piston and the cylinder.
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