A 2-stroke engine, mounted on the original engine bed. Engines of this type were used, among others, in Grunau Motor-Baby motor gliders, and in Poland in the Bak I motor glider.
| Configuration | 2-cylinder flat |
| Cooling | air |
| Displacement | 0.634 l |
| Weight | 27.8 kg |
| Maximum power | 18 hp at 2700 rpm |
| Cruising power | 16.6 hp at 2650 rpm |
