Since you're a beginner asking for advice, I'll offer the advice that you'll be better off with a 2 stroke engine in your Cub. It sounds like you are price sensitive (nothing wrong with that) and for comparable quality 4 strokes are significantly more expensive. Put a Thunder Tiger .46 Pro or an OS .46 AX in the plane and enjoy the power and reliability of a quality 2 stroke. There are no valves to adjust, no difficulties with idling, no weird throttle linkages to figure out, and the tuning is really simple. I have a Magnum 4 stroke (same thing as an ASP) that does what it's supposed to do, but there is a very obvious quality different between it and the OS and Saito 4 strokes. I probably won't own another one as I'd prefer to spend my flying field time flying instead of fooling with my engine. So if the choice is a good 2 stroke or a cheap 4 stroke, get a good 2 stroke and have fun flying your Cub.