| Year | 1978 |
| Bore x Stroke | 64 х 62 mm |
| Capacity | 398 cc / 24.2 cu-in |
| Clutch | Wet multiplate |
| Compression Ratio | 6.2 :1 |
| Consumption Average | 43 mpg |
| Cooling System | Air cooled |
| Dimensions | Length 1995 mm / 78.5 in Width 760 mm / 3.0 in Height 1060 mm / 41.7 in |
| Dry Weight | 165.5 kg / 364.8 lbs |
| Engine | Two stroke, parallel twin cylinder, reed-valve torque induction |
| Final Drive | Chain |
| Front Brakes | Single 267mm disc |
| Front Suspension | Telescopic forks |
| Front Tyre | 3.00S-18 |
| Fuel Capacity | 16.5 Litres / 4.3 US gal |
| Ground Clearance | 150 mm / 5.9 in |
| Ignition | CDI |
| Induction | 2x 28mm Mikuni carburetors |
| Lubrication | Autolube |
| Max Power | 44 hp / 32.3 kW @ 7500 rpm |
| Max Torque | 41.1 Nm / 4.2 kgf-m @ 7000 rpm |
| Rear Brakes | Single 267mm disc |
| Rear Suspension | Swing arm, dual shocks |
| Rear Tyre | 3.50S-18 |
| Seat Height | 800 mm / 31.4 in |
| Standing ¼ Mile | 14.1 sec / 90.1 mph 145 km/h |
| Starting | Kick |
| Top Speed | 106.8 mph 172 km/h |
| Transmission | 6 Speed |
| Wet Weight | 171 kg / 376 lbs |
| Wheelbase | 1320 mm / 51.9 in |
