| Year | 1991 |
| Bore x Stroke | 55 x 42 mm |
| Capacity | 399 cc / 24.3 cu-in |
| Compression Ratio | 11.3:1 |
| Cooling System | Liquid cooled |
| Dry Weight | 183 kg / 416.7 lb |
| Engine | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. |
| Final Drive | Chain |
| Front Brakes | Single 310mm disc 2 piston caliper |
| Front Suspension | 41mm Telescopic forks |
| Front Tyre | 110/70-17 |
| Fuel Capacity | 13 Litres / 3.9 US gal |
| Ignition | CDI |
| Induction | 2x 30mm Keihin CV carburetor |
| Max Power | 55.2 hp / 46.5 kW @ 10000 rpm |
| Max Torque | 21.39.3 Nm / 29 lb-ft @ 9500 rpm |
| Rear Brakes | Single 240mm disc 1 piston caliper |
| Rear Suspension | Pro-link monoshock |
| Rear Tyre | 140/60-17 |
| Starting | Electric |
| Transmission | 6 Speed |
