WR400
| WR400FN | |
| Type | DOHC, 4 stroke, 5-valve, liquid cooled, single. |
| Displacement | 399cc |
| Bore & stroke | 92.0 x60.1mm |
| Compression ratio | 12.5 : 1 |
| Lubrication | Dry sump |
| Carburetion | "New Type" Keihin FCR 39H/1 |
| Ignition | CDI |
| Starter system | kick |
| Fuel tank capacity | 8.0 L |
| Dry Weight | 113kg |
| Transmission
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| Final Drive | Chain drive |
| Overall Length | 2,171mm |
| Overall Width | 827mm |
| Overall Height | 1,303mm |
| Seat Height | 998mm |
| WheelBase | 1,490mm |
| Ground Clearance | 373mm |
| Front Suspension | 43mm Kayaba, telescopic fork, upside down fork, compression/ rebound adjustable 300mm travel. 0.46kg/mm spring rate |
| Rear Suspension | Kayaba monocross shock preload compression rebound adjustable 315mm travel. 5.0kg/mm spring rate. |
| Front Brakes | Single disc 245mm |
| Rear Brakes | Single disc 220mm |
| Front Tires | 90/90-21Michelin |
| Rear Tires | 120/90-18 Michelin |
| Colours | Team Yamaha Blue & White |