I used Monocote on mine to keep the weight down. I had a Moki 180 with Cline fuel system on it. I have sold the Moki and the Stinker has been hanging on my workshop ceiling for about two years now. I have a couple of DA-50s and toyed with the idea of putting one in this but I think it would be way overkill A gasser in the 40cc range would be better suited. This was a real brute with the Moki but even with the Cline fuel system I had problems with it going lean on me when I would really start throwing it around. After a flame out during a low level torque roll and cleaning the gear off the Pitts I got rid of the Moki, repaired and hung the plane until a better engine choice comes along.