OK,

So it seems that my OS 40FX which has provided me with adequate power for over a year is dying. Or at least, it doesn't have the necessary power for my Magic Extra 300 to do 3D. I'm running a 11x4 prop on it. It does not have enough power to 3D. It takes really a long take off.

I thought of upgrading to a SuperTigre 51 or a Magnum 53 engine. Those engines should have enough kick. I could also go OS, but it's expensive, and I would steer away from it.

I'm looking for an engine with power, people have recommended the GMS 47, I've seen it in action and it really has a lot of power. The bad thing is, it isn't long lasting... after a while air leaks develop. Four strokes are too expensive despite their advantages.

Can someone recommend me an engine?