2011 Yamaha YZ450F has a new clutch lever and pushrod for more consistent clutch feel during long motos. The 2010 YZ450F garnered the reputable title of Dirt Rider Magazine’s “Bike of the Year”. Not to mention Cycle World’s “Best Motocrosser” and Motorcycle Magazine’s “Best Dirtbike of 2010.”The 4-titanium valve cylinder head is matched to a fuel injection system developed specifi cally for the YZ450F. Instantly adapts to changing air/fuel mixtures depending on altitude and temperature, for an engine that delivers no matter what conditions. The aluminum Bilateral Beam frame provides a superb rigidity balance that complements the engine for unmatched lightweight handling and cornering. The result? The best cornering, most nimble 450F for all track conditions.
Yamaha YZ450F uses a battery-less fuel injection system with a 12-hole injector for superb fuel atomization. The 44mm Keihin® throttle body is designed for easy starting, with an integrated cold start and idle speed adjustment knob. Yamaha FI provides optimal air/fuel mixtures in all altitudes and wide range of temperatures for outstanding throttle response.4-titanium valve cylinder head with a “pent-roof” design combustion chamber provides excellent combustion efficiency and unequalled power output.The bigger 97.0mm bore and shorter 60.8mm stroke, along with a higher 12.5:1 compression ratio, create a combustion chamber that delivers really impressive power.
The KYB® Speed Sensitive front fork has excellent feel and shock absorption. KYB® rear shock with large capacity piggy back reservoir and 50mm piston for more consistent damping control.
Riders have a choice of two color options: Team Yamaha Blue and White or White and Red.
2011 Yamaha YZ450F – USA Specifications
MSRP*
$8,250 (White/Red) Available from September 2010
$8,150 (Team Yamaha Blue/White) Available from September 2010
Engine
Type 449cc liquid-cooled DOHC 4-stroke; 4 titanium valves
Bore x Stroke 97.0 x 60.8mm
Compression Ratio 12.5:1
Fuel Delivery Yamaha Fuel Injection (YFI), Keihin® 44mm
Ignition CDI
Transmission Constant-mesh 5-speed; multiplate wet clutch
Final Drive Chain Drive
Chassis
Suspension / Front KYB® Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel
Suspension / Rear KYB® Fully adjustable single shock; 12.4-in travel
Brakes / Front Hydraulic single disc brake, 250mm
Brakes / Rear Hydraulic single disc brake, 245mm
Tires / Front 80/100-21-Dunlop® D-742FA
Tires / Rear 120/80-19-Dunlop® D-756
Dimensions
Length 86.3 in
Width 32.4 in
Height 51.6 in
Seat Height 39.3 in
Wheelbase 58.7 in
Ground Clearance 15.0 in
Fuel Capacity 1.63 gal
Wet Weight*** 245 lb
Other
Warranty 30 Day (Limited Factory Warranty)





























