Yamaha reshaped motocross in 2010 with the introduction of its radical YZ450F, but for 2011 the silence from the blue camp is just as impressive. The Tuning Fork crew only made a pair of changes to the 2011 Yamaha YZ450F, and if you listen to what Yammie reps have to say, that’s as groundbreaking as the original full-blown redesign. The other change is a reshaping of the clutch actuation arm which has a slightly different cam shape and is 6mm longer.
Engine: 449cc liquid-cooled Single, DOHC, 4-valve
Bore x Stroke: 97 x 60.8mm
Compression Ratio: 12.5:1
Fuel Delivery: Fuel-injection
Clutch: Wet multi-plate, cable actuation
Transmission: 5-Speed
Final Drive Gearing: 13F/48R
Front Suspension: Kayaba Speed Sensitive System 47mm fork, 20-position compression and 20-position rebound damping adjustment; 12.2 in. travel
Rear Suspension: Kayaba gas charged shock absorber, 20-position low-speed and step-less high-speed compression damping, 20-position rebound damping and adjustable spring preload; 12.4 in. travel
Front Brake: 250mm petal disc, dual-piston caliper
Rear Brake: 245mm petal disc, 1-piston caliper
Handlebar: Pro Taper
Front Tire: Dunlop D742FA 90/100-21
Rear Tire: Dunlop D756 120/80-19
Wheelbase: 58.7 in. Length: 86.3 in. Width: 32.4 in. Ground Clearance: 15.0 in.
Seat Height: 39.3 in.
Fuel Capacity: 1.64 gal.
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