| Year | 1999 |
| Bore x Stroke | 100 X 82 mm |
| Capacity | 644 c / 39.2 cu-in |
| Compression Ratio | 8.3:1 |
| Cooling System | Air cooled |
| Dry Weight | 161 kg / 354.9 lbs |
| Engine | Four stroke, single cylinder, SOHC. 4 valve |
| Final Drive | Chain |
| Front Brakes | Single 296mm disc 2 piston caliper |
| Front Suspension | Telescopic forks |
| Front Tyre | 100/90-19 |
| Fuel Capacity | 13 Litres / 3.4 US gal |
| Ignition | Capacitor Discharge |
| Induction | Single 40mm Keihin VE-type carb. |
| Max Power | 39.4 hp / 28.7 kW @ 5750 rpm |
| Max Torque | 54 Nm / 39.8 ft. lb @ 4500 rpm |
| Rear Brakes | Single 220mm disc 1 piston caliper |
| Rear Suspension | Swinging arm |
| Rear Tyre | 120/90-17 |
| Seat Height | 845 mm / 33.3 in |
| Starting | Electric |
| Transmission | 5 Speed |
| Wheelbase | 1440 mm / 56.7 in |
