Jawa 638
| Make Model | Jawa 638 |
| Year | 1984 |
| Engine | Air cooled, two stroke, parallel twin |
| Capacity | 343.4 |
| Bore x Stroke | 58 x 65 mm |
| Compression Ratio | 10.2:1 |
| Induction | |
| Ignition / Starting | Electronic / kick |
| Max Power | 25 hp @ 5500 rpm |
| Max Torque | 33 N4m @ 5250 rpm |
| Transmission / Drive | 4 Speed / chain |
| Front Suspension | Hydraulic telescopic forks |
| Rear Suspension | Dual shock absorbers |
| Front Brakes | 260mm drum |
| Rear Brakes | 160mm drum |
| Front Tyre | 3.25 -18 |
| Rear Tyre | 3.50 -18 |
| Dry-Weight | 154 kg |
| Fuel Capacity | 17 Litres |