2009 YAMAHA YZ450F, Yamaha's profilation of this bikeThe bike that started the four-stroke revolution benefits from chassis refinements that ensure the five-titanium-valved YZ450F remains at the head of the open-class pack.Most things are still the same, like the usable spread of power dished out through the Tuning Fork's five-valve, 449cc dual overhead cam motor. Top-end is especially impressive, but we couldn't find a weak spot anywhere in the powerband. Gearing was close enough for the mountainous layout at GH, but shifting was a highlight this year with a noticeable lack of missed shifts and false neutrals thanks to a beefed up shift fork pin. A new hydroformed swingarm creates a different feel in the rear end. The new unit is a piece of aluminum art compared to the old with a sleeker design and a noticeable lack of the linkage hole which cleans up the appearance.General informationModel: Yamaha YZ450FYear: 2009Category: Cross / motocrossRating: 69.4 out of 100. Show full rating and compare with other bikesPrice as new (MSRP): US$ 7399. Prices depend on country, taxes, accessories, etc.Engine and transmissionDisplacement: 449.00 ccm (27.40 cubic inches)Engine type: Single cylinder, four-strokeCompression: 12.3:1Bore x stroke: 95.0 x 63.4 mm (3.7 x 2.5 inches)Valves per cylinder: 5Fuel system: Carburettor. Keihin FCR MX39Fuel control: DOHCIgnition: CDICooling system: LiquidGearbox: 5-speedTransmission type,final drive: ChainChassis, suspension, brakes and wheelsFront suspension: Speed-Sensitive System inverted forkFront suspension travel: 300 mm (11.8 inches)Rear suspension: Fully adjustable single shockRear suspension travel: 312 mm (12.3 inches)Front tyre: 80/80-21Rear tyre: 120/80-19Front brakes: Single discFront brakes diameter: 245 mm (9.6 inches)Rear brakes: Single discRear brakes diameter: 245 mm (9.6 inches)Physical measures and capacitiesWeight incl. oil, gas, etc: 108.0 kg (238.0 pounds)Seat height: 988 mm (38.9 inches) If adjustable, lowest setting.Overall height: 1,306 mm (51.4 inches)Overall length: 2,195 mm (86.4 inches)Overall width: 826 mm (32.5 inches)Ground clearance: 373 mm (14.7 inches)Wheelbase: 1,494 mm (58.8 inches)Fuel capacity: 6.81 litres (1.80 gallons)Other specificationsColor options: T
