| Year | 1991 |
| Battery | 12V 16Ah |
| Bore x Stroke | 70.5 x 51 mm |
| Capacity | 398 cc / 24.3 cu in |
| Compression Ratio | 10.0:1 |
| Cooling System | Air cooled |
| Dimensions | Length: 2020 mm / 79.5 in Width: 730 mm / 28.7 in Height: 1110 mm / 43.7 in |
| Dry Weight | 173 kg / 381 lbs |
| Engine | Four stroke, 90°“L”twin cylinder, SOHC, desmodromic 2 valve per cylinder. |
| Final Drive | Chain |
| Final Drive Ratio | 3.210:1 (14/45) |
| Front Brakes | Single 320 mm disc |
| Front Suspension | Marzocchi inverted telescopic fork, 40USD/E |
| Front Tyre | 130/60 VR17 |
| Fuel Capacity | 17 L / 4.5 US gal / 3.7 Imp gal |
| Gear Ratios | 1 st 3.071 / 2nd 2.111 ./ 3rd 1.590 / 4th 1.280 / 5th 1.074 / 6th 0.931:1 |
| Ignition | Kokusan electronic |
| Induction | Mikuni B79 carburetor |
| Max Torque | 35.2 Nm / 3.6 kgf-m / 26 ft-lb @ 8500 rpm |
| Max Power | 30.9 kW / 42 hp @ 10000 rpm |
| Primary Drive Ratio | 2.264:1 (34/77) |
| Rear Brakes | Single 245 mm disc |
| Rear Suspension | Cantilever swingarm, Marzocchi PBS1R monoshock, preload and rebound damping |
| Rear Tyre | 160/60 VR17 |
| Seat Height | 750 mm / 29.5 in |
| Spark Plugs | Champion L82YC (from 1994: RL82Y) |
| Starting | Electric |
| Top Speed | 180 km/h / 112 mph |
| Transmission | 6 Speed |
| Wheelbase | 1410 mm / 55.5 in |
