| Year | 2001 |
| Bore x Stroke | 95 x 60.1 mm |
| CapacityYamaha WR 426F | 449 cc / 25.9 cu-in |
| Compression Ratio | 12.5:1 |
| Cooling System | Lliquid cooled |
| Dry Weight | 114 kg / 251.3 lbs |
| Engine | Four stroke, single cylinder, DOHC, 5 valve |
| Final Drive | Chain |
| Front Brakes | Single 250mm disc |
| Front Suspension | 46mm Kayaba inverted telescopic forks compression and rebound damping adjustable |
| Front Tyre | 80/100-21 |
| Front Wheel Travel | 300 mm / 11.8 in |
| Fuel Capacity | 8 Litres / 2.1 US gal |
| Ground Clearance | 373 mm / 14.7 in |
| Ignition | Digital CDI |
| Induction | 39mm Keihin FCR39H carburetor |
| Max Power | 58.1 hp / 42.4 kW @ 9000 rpm |
| Max Torque | 49 Nm @ 7000 rpm |
| Rake | 27.2 ° |
| Rear Brakes | Single 245mm disc |
| Rear Suspension | Fully adjustable Kayaba single shock, 315mm wheel travel, separate high and low speed compression adjustment. |
| Rear Tyre | 110/90-18 |
| Rear Wheel Travel | 315 mm / 12.4 in |
| Seat height | 960 mm / 37.9 in |
| Starting | Kick |
| Transmission | 5 Speed |
| Wheelbase | 1490 mm / 58.7 in |
