Update: the 2010 Yamaha YZ450F has been officially unveiled and, yeah, this was it. Click here to see it.This shot of the 2010 Yamaha YZ450F is getting a lot of attention and rightly so. We can't remember having seen any reversed cylinder machines sold to the public since the 1990 Yamaha TZ250A privateer road-racer. Beyond the reversed single-cylinder, the new YZ450F looks to be an entirely new bike, with a slew of refinements including front and rear suspension, rear frame, new seat and we're guessing a completely revised chassis as well. While we think the Yamaha looks pretty cool and will be fast in the dirt, we're holding out for a  supermoto version.


The logic behind the reversed cylinder is better weight distribution by pushing the crank down and forward in the chassis for improved handling as well as a cooler intake and a direct line of flow from intake through the cylinder to the exhaust port. This was also the criteria for the reversed-cylinder TZ250, which, if memory serves right, was

known to be rather delicate

, cracking motor mounts and causing water pump failures, chassis harmonics and vibration issues. Hopefully Yamaha has fixed all those gremlins this time.

via MCN
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