| Year | 1985 |
| Bore x Stroke | 52 х 47mm |
| Capacity | 399 cc / 24.3 cu-in |
| Compression Ratio | 9.5:1 |
| Cooling System | Air cooled |
| Dry Weight | 179 kg / 394.6 lbs |
| Engine | Four stroke, transverse four cylinder, DOHC, 2 Valve per cylinder. |
| Final Drive | Chain |
| Front Brakes | Single 236mm disc |
| Front Suspension | Telescopic forks |
| Front Tyre | 90/90-19 |
| Fuel Capacity | 15 Litres / 3.9 US gal |
| Ignition | CDI |
| Induction | 4 x 21mm Teir-Kei carburetors |
| Max Power | 54 hp / 40.2 kW @ 11500 rpm |
| Max Torque | 34.3 Nm / 25.2 lb-ft @ 8500 rpm |
| Rear Brakes | Single 140mm drum |
| Rear Suspension | Swing arm |
| Rear Tyre | 110/90-18 |
| Starting | Electric |
| Transmission | 6 Speed |
