Hi everybody,

I have built a gp venus and can't get decide which engine to use. Actually ı have mounted a ys 45. But this engine dissaopinted me or I could not solve her languge. But anyway I have decided to change the engine in terms of having no more headaches like with my ys 45. Actually it spins 11*6 apc with powermaster 20 at 11300rpm but not enough for 2300gr gp venus to go unlimited vertical.

please give me your recomendations about the engine choice!!

-should I buy a os 50 sx with mac's black muffler or,

-should ı buy a os 61 fx and have the power ı need with a 300gr more weigth.