| 2004 Yamaha YFZ450 | |
| Engine | |
| Type | 439cc 4-Stroke Single, Liquid-Cooled w/Fan, Titanium 5-Valve DOHC |
| Bore x Stroke | 95mm x 62mm |
| Compression Ratio | 11.9:1 |
| Carburetion | Keihin 39mm FCR w/Throttle Position Sensor |
| Ignition | DC-CDI w/3D Mapping |
| Starting System | Electric |
| Transmission | 5-Speed Manual Clutch |
| Drive Train | 2WD; Sealed O-Ring Chain |
| Chassis | |
| Suspension/Front | Independent Double Wishbone, 9.1” of Travel w/Rebound, Compression and Threaded Preload Adjustment |
| Suspension/Rear | Cast Aluminum Swingarm, 10.1” of Travel w/Rebound, Compression and Threaded Preload Adjustment |
| Brakes/Front | Dual, Twin Piston Hydraulic Discs |
| Brakes/Rear | Hydraulic Disc |
| Tires/Front | AT21x7-10 Radial |
| Tires/Rear | AT20x10-9 Radial |
| Dimensions | |
| L x W x H | 72.4” x 46.1” x 42.9” |
| Seat Height | 31.5” |
| Wheelbase | 50.4” |
| Ground Clearance | 4.4” |
| Fuel Capacity | 2.6 Gallons |
| Dry Weight | 350 Lbs. |
| Other | |
| Lighting | Dual 30W Krypton Multi-Reflector Headlights & 21/5W Brake Light |
| Colors | Team Yamaha Blue, White/Red |
| Warranty | 6 Month (Limited Factory Warranty) |
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