| Cylinders | 1 |
| Bore | 70 mm (IM 250) - 76 mm (IM 300) - 82 mm (IM 350) |
| Stroke | 66 mm |
| Displacement | 254 cm3 (IM 250) - 300 cm3 (IM 300) - 349 cm3 (IM 350) |
| Max inclination during operation | 30°, max 30 min / 35°, max 1 min |
| Oil capacity (MAX level.) including oil filter | 0,6 lt. |
| Dry weight | 28 kg |