| MODEL | YAMAHA WR 450F 2-TRAC 2004 |
| Year | 2004 |
| Engine Type | Four stroke, single cylinder, DOHC, 5 titanium valves |
| Displacement / Capacity | 449 cc / 27.4 cu in |
| Bore X Stroke | 95 x 63.4 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 42.3 kW / 58 hp @ 9000 rpm |
| Max Torque | 49 Nm / 33.1 lb-ft @ 7000 rpm |
| Ignition | Digital CDI |
| Induction | 39 mm Keihin FCR flat-slide carburettor with throttle position sensor |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5 speed |
| Clutch | Wet, multi-disc, cable operated |
| Final Drive | O-ring chain |
| CHASSIS SPECS | |
| Frame | Steel, single cradle |
| Front Suspension | 46 mm Kayaba inverted telescopic fork, compression and rebound damping adjustable, 300 mm / 11.8 in travel |
| Rear Suspension | Fully adjustable Kayaba single shock, 318 mm / 12.4 in travel |
| Front Brakes | Single 250 mm disc, 4-piston caliper |
| Rear Brakes | Single 245 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2175 mm / 85.6 in |
| Overall Width | 825 mm / 32.5 in |
| Overall Height | 1300 mm / 51.2 in |
| Seat Height | 998 mm / 39.3 in |
| Wheelbase | 1485 mm / 58.5 in |
| Ground Clearance | 365 mm / 14.3 in |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 80/100-21 |
| Rear Tyre | 110/100-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8 Litres / 2.1 US gal |
| Fuel Consumption | — |
| Top Speed | — |
A limited-production WR450F with hydraulic front-wheel drive: a pump on the gearbox feeds a motor in the front hub, sending a share of power to the front wheel. It helped traction and stability in sand and dunes, and David Fretigne won the 450 class at the 2004 Dakar on one, but it made steering heavier on hard, technical ground.
