I have a Evo .45 trainer engine and it is the best engine that I've had. I got it on a second hand trainer. I didn't know about crankcase loading, etc, and I just flew the snot out of the engine. It never burped, stumbled, or hesitated. Of course, I knew next to nothing about needle valves. The only time it did quit was twice after I had run it into some high weeds. I found a lot of debris from the carb when I flushed it. Some big stuff floating around in the cup after flushing. After that, back to more of the same kind of running. I have to say that the engine appears to be the only 100% reliable engine I"ve seen, excepting the trash in the high speed needle valve incident. The Xtra Easy 2 that it is on is kinda big and heavy, but when I took the flywheel weight off, and added an APC 11x7 prop, it was a fine flying trainer. The engine will pull the plane almost straight up after a 5-6 foot roll.

If you get a good one, you won't want to part with it.