| Year | 1990 |
| Bore x Stroke | 68 х 55 mm |
| Capacity | 399 cc / 24.3 cu-in |
| Clutch | Wet multi-plate, cable operated |
| Compression Ratio | 9.7:1 |
| Cooling System | Air cooled |
| Dry Weight | 178 kg / 392 lbs |
| Engine | Four stroke, 70°V-Twin cylinder, SOHC, 2 valves per cylinder. |
| Final Drive | shaft |
| Front Brakes | Single disc with single-piston caliper |
| Front Suspension | Telescopic forks |
| Front Tyre | 3.00S19 4PR |
| Fuel Capacity | 8.6 Litres / 2.2 US gal |
| Ground Clearance | 145 mm / 5.7 in |
| Ignition | CDI |
| Induction | 2 x 34 mm Mikuni carburettors |
| Max Power | 40 hp / 29.8 kW @ 8500 rpm |
| Max Torque | 3.5 kgf-m / 25.3 lb-ft @ 7000 rpm |
| Rake | 31.5° |
| Rear Brakes | 200 mm Drum |
| Rear Suspension | Dual shocks with preload adjustment |
| Rear Tyre | 140/90 15 M/C 70S |
| Seat Height | 700 mm / 27.5 in |
| Starting | Electric |
| Trail | 125 mm / 4.9 in |
| Transmission | 5 speed constant mesh |
| Wet Weight | 185 kg / 407.8 lbs |
| Wheelbase | 1511 mm / 59.4 in |
