| Attribute | Yamaha YZ450F 2010 × | Kawasaki KX450F 2009 × |
|---|---|---|
| General | ||
| Production from (year) | 2010 | 2009 |
| Make | Yamaha | Kawasaki |
| Model | Yamaha YZ450F | Kawasaki KX450F |
| Category | Cross / motocross | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Valves per cylinder | 4 | 4 |
| Fuel system | Injection. Fuel Injection (FI), Keihin® 44mm | Injection. 43mm Keihin Throttle body |
| Displacement (cm³) | 449 | 449 |
| Cooling system | Liquid | Liquid |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 97 | 96 |
| Stroke (mm) | 60.8 | 62.1 |
| Gearbox | 5-speed | 5-speed |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) | Double Overhead Cams/Twin Cam (DOHC) |
| Ignition | TCI | Digital DC-CDI |
| Compression | 12.5:1 | 12.5:1 |
| Chassis | ||
| Front suspension | KYB® Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel | 48mm inverted, Kayaba AOS with DLC coated sliders, 22-position compression and 20-position rebound dampening adjustment / 12.4 in. |
| Rear suspension | KYB® Fully adjustable single shock; 12.4-in travel | UNI-TRAK® linkage system and Kayaba shock with 22-position low-speed and stepless high-speed compression dampening |
| Front brakes | Single disc | Single disc |
| Rear brakes | Single disc | Single disc |
| Diameter (mm) | 245 | 240 |
| Front tyre | 80/100-21 | 90/80-21 |
| Rear tyre | 120/80-19 | 120/80-19 |
| Trail (mm) | - | 117 |
| Rake (fork angle) (degree) | - | 26.7 |
| Other | ||
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 1,491 | 1,481 |
| Kerb weight (kg) | 111.1 | 112.1 |
| Overall height (mm) | 1,311 | 1,280 |
| Overall length (mm) | 2,192 | 2,184 |
| Overall width (mm) | 823 | 820 |
| Seat height (mm) | 998 | 965 |
| Ground clearance (mm) | 381 | 340 |
| Performance | ||
| Fuel capacity (l) | 6.05 | 7 |