| Year | 1981 |
| Bore x Stroke | 85 x 76 mm |
| Capacity | 431 cc / 26.3 cu-in |
| Clutch | Wet plate |
| Compression Ratio | 7.1:1 |
| Cooling System | Air cooled |
| Dry Weight | 104 kg / 229.2 lbs |
| Engine | Two stroke, single cylinder, reed valve |
| Exhaust | Expansion chamber |
| Final Drive | #520 Chain; 14T/54T |
| Frame | Chrome-moly steel |
| Front Brakes | Drum |
| Front Suspension | 41mm Showa air-adjustable forks with three compression damping adjustments |
| Front Tyre | 3.00-21 |
| Front Wheel Travel | 305 mm / 12.0 in |
| Fuel Capacity | 9 Litres / 2.38 US gal |
| Gear Ratio | 1st 15.66 / 2nd 11.67 / 3rd 9.18 / 4th 7.63 |
| Ground Clearance | 325 mm / 12.8 in |
| Ignition | CDI external flywheel |
| Induction | Single 38mm Keihin flat-slide carburettor |
| Lubrication | Pre-mix |
| Max Power | 52.9 hp / 39.4 kW @ 6500 rpm |
| Max Torque | 57.7 Nm / 42.6 lb-ft @ 6000 rpm |
| Overview | Pulpmx.com |
| Primary Drive | Straight-cut gears |
| Rake | 29.5° |
| Rear Brakes | Drum |
| Rear Suspension | Pro-Link with four compression damping adjustments |
| Rear Tyre | 5.10-18 |
| Rear Wheel Travel | 312 mm / 12.3 in |
| Seat Height | 950 mm / 37.4 in |
| Starting | Kick |
| Trail | 4.8 in |
| Transmission | 4 Speed |
| Wet Weight | 113 kg / 248 lbs |
| Wheelbase | 1507.7 mmmm / 59.4 in |
