| Cylinders | 2 |
| Bore | 80 mm (25 LD 330-2) - 85 mm (25 LD 425-2) |
| Stroke | 65 mm (25 LD 330-2) - 75 mm (25 LD 425-2) |
| Displacement | 654 cm3 (25 LD 330-2) - 851 cm3 (25 LD 425-2) |
| Max inclination during operation | 30°, max 30 min / 35°, max 1 min |
| Oil capacity (MAX level.) including oil filter | 1,8 lt. |
| Dry weight | 50 kg (25 LD 330-2) - 53 kg (25 LD 425-2) |