I have not tore into mine yet waiting on alot of info before I get started . I really want to go gas. I know of a guy who put a saito 125 on his and still had to add weight to ballance it. the BCMA 26 motor weighs 33 oz complete and a saito weighs 24.69 oz. so if he had to add weight to ballance I would rather add motor than lead. plus the BCMA motor is $275 the saito is $339. the difference is a digital servo I was planning to add smoke on this plane ust have to see how it flies before i tackel that project.