| Model | TRX400EX |
| Engine Type | 397cc RFVC air-cooled dry-sump single-cylinder four-stroke |
| Bore and Stroke | 85mm x 70mm |
| Carburetion | 38mm piston-valve with accelerator pump |
| Ignition | CD with electronic advance |
| Starter | Electric |
| Clutch | Manual |
| Transmission | Five-speed |
| Driveline | O-ring-sealed chain |
| Suspension | Front: Independent double-wishbone with Showa shocks, five-position spring preload adjustability; 8.2 inches travel Rear: Pro-Link fully adjustable single Showa shock; 9.1 inches travel |
| Brakes | Front: Dual hydraulic 174mm discs Rear: Single 220mm disc |
| Tires | Front: 22 x 7-10 knobby radial Rear: 20 x 10-9 knobby radial |
| Length | 72.2 inches |
| Width | 45.3 inches |
| Height | 43.7 inches |
| Seat Height | 31.9 inches |
| Ground Clearance | 4.3 inches |
| Wheelbase | 48.4 inches |
| Turning Radius | 10.5 feet |
| Dry Weight | 375 pounds |
| Fuel Capacity | 2.6 gallons, including 0.4-gallon reserve |
| Colors | Red, Yellow |
| For highly experienced riders 16 years of age and older. | |