Last year the new Yamaha YZ450F motocross bike garnered the reputable title of Dirt Rider Magazine’s "Bike of the Year." Not to mention Cycle World’s "Best Motocrosser", Motorcycle Magazine’s "Best Dirtbike of 2010," and Ultimate MotorCycling’s "Gamer Changer".
For 2011 the YZ 450 F gets a new clutch lever and pushrod for more consistent clutch feel during long motos.
As introduced last year, the Yamaha YZ450F rearward-slanted cylinder is a revolutionary advancement that achieves greater mass centralization, concentrating inertial mass toward the center of the motorcycle.
This Yamaha design also swaps traditional intake and exhaust positions, putting the lightweight airbox and throttle body out front. This contributes to mass centralization for nimble handling while also achieving a straight intake tract for superb combustion efficiency that delivers more power.
The YZ cylinder is offset so the connecting rod is vertical at the moment of greatest combustion force, minimizing piston friction against the cylinder wall that could reduce power.
The 4-titanium valve cylinder head is matched to a fuel injection system developed specifically for the YZ450F. Instantly adapts to changing air/fuel mixtures depending on altitude and temperature, for an engine that delivers no matter what conditions.
From Yamaha Genuine Motorcycle Accessories is the GYTR Power Tuner that lets dirt bike tuners adjust air/fuel mixture and ignition timing maps to match YZ450F engine performance characteristics to the rider and track conditions.
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