I have a .25FX and was told it has the power of a .40LA,, makes sense but I havent flown it yet (the .25) but the few runs in the front yard for break in show it to be a thirsty beast...the .40LA I have was on a trainer,, I love that engine, I hope to get another trainer at an upcoming swapmeet to get it back in the air...also have a stick with a .65 Saito on it, that I would like to replace with a go .60+ size 2 stroke,,,dont care much for 4 strokes...just dont sound right...have to wait and see what I find at the swap meet here in Jan..Rog