| Year | 1981 |
| Bore x Stroke | 67 x 56.6 mm |
| Capacity | 398 cc / 24.3 cu in |
| Clutch | Wet multiple plates, coil spring |
| Compression Ratio | 10.5:1 |
| Cooling System | Air cooled |
| Engine | Four stroke, parallel twin, DOHC, 4 valves per cylinder. |
| Final Drive | Chain |
| Frame | Double cradle |
| Front Brakes | Single disc |
| Front Suspension | Air assisted telescopic forks |
| Front Tyre | 3.60S-18 4PR |
| Gear Ratio | 1st 2.461 / 2nd 1.777 / 3rd 1.380 / 4th 1.125 / 5th 0.961 / 6th 0.851:1 |
| Ignition | Transistorized |
| Induction | 2 x Mikuni BS34SS carburetors |
| Lubrication | Wet sump |
| Max Power | 32.8 kW / 44 hp @ 9500 rpm |
| Max Torque | 36.3 Nm / 3.7 kgf-m 26.8 lb-ft @ 8000 rpm |
| Oil Capacity | 3.0 Litres / 3.2 US qt / 2.6 Imp qt |
| Primary Drive Ratio | 2.714 |
| Rear Brakes | Drum |
| Rear Suspension | Dual shocks, preload adjustable |
| Rear Tyre | 4.10S-18 4PR |
| Secondary Drive Ratio | 2.933 |
| Starting | Electric |
| Transmission | 6 speed constant mesh |
