| Yamaha's profilation of this bike | 
  | The 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. | 
    
        | General information | 
  
    | Motorcycle name | Yamaha YZ450F | 
    | Model year | 2009 | 
    | Category | Cross / motocross | 
| Price as new | US$ 7399.   MSRP depends on country, taxes, accessories, etc. | 
    | Rating | 3.5   Check out the detailed rating of off-road capabilities, engine performance, maintenance cost, etc. Compare with any other bike. | 
    
        | Engine and transmission | 
  
    | Displacement | 449.0 ccm (27.40 cubic inches) | 
    | Engine type | Single cylinder, four-stroke | 
    | Compression | 12.3:1 | 
    | Bore x stroke | 95.0 x 63.4 mm (3.7 x 2.5 inches) | 
    | Valves per cylinder | 5 | 
    | Fuel system | Carburettor. Keihin FCR MX39 | 
    | Fuel control | Double Overhead Cams/Twin Cam (DOHC) | 
    | Ignition | CDI | 
    | Cooling system | Liquid | 
    | Gearbox | 5-speed | 
    | Transmission type | Chain  (final drive) | 
    
        | Chassis, suspension, brakes and wheels | 
  
    | Front suspension | Speed-Sensitive System inverted fork | 
    | Front wheel travel | 300 mm (11.8 inches) | 
    | Rear suspension | Fully adjustable single shock | 
    | Rear wheel travel | 312 mm (12.3 inches) | 
    | Front tire | 80/80-21 | 
    | Rear tire | 120/80-19 | 
    | Front brakes | Single disc | 
    | Diameter | 245 mm (9.6 inches) | 
    | Rear brakes | Single disc | 
    | Diameter | 245 mm (9.6 inches) | 
    
        | Physical measures and capacities | 
  
    | Weight incl. oil, gas, etc | 108.0 kg (238.0 pounds) | 
    | Seat height | 988 mm (38.9 inches) If adjustable, lowest setting. | 
    | Overall height | 1306 mm (51.4 inches) | 
    | Overall length | 2195 mm (86.4 inches) | 
    | Overall width | 826 mm (32.5 inches) | 
    | Ground clearance | 373 mm (14.7 inches) | 
    | Wheelbase | 1494 mm (58.8 inches) | 
    | Fuel capacity | 6.81 litres (1.80 US gallons) | 
    
        | Other specifications | 
  
    | Color options | Team Yamaha Blue/White, White/Red | 
| Update specs | Report missing specs or required updates. | 
    
        | Further information | 
  | Insurance costs | Compare US insurance quotes from the nation's top providers. | 
| Maintenance | Find parts, fluids. filters, maintenance tools and service manuals at Amazon.com. | 
| Ask questions | Join the 09 Yamaha YZ450F discussion group or the general Yamaha discussion group. | 
| Related bikes | List related bikes for comparison of specs. | 
    
        | Compare with another motorcycle | 
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