First plane? Hmmmm....... the Piper Cub is not really a trainer... 'nuff said about that

I've got a Saito 72, an OS FS70 and an ASP 52 4 stroke, so my experience is based on these...

The Saito requires a 40 min inial break in run on a test stand on a very rich setting to not exceed 4,000 rpm. For this, ideally you need to have some previous experince with model engines and a tach. It would be best not to do the inial run on the plane. After this period when the engine is on the plane, you'll find that the low end needle is set very rich. I had the help of a very experience club member to get the engine running right, and it was a lengthy process of tweeking the low end mixture to get it just right.

OTOH, the OS and the ASP ran pretty well straight from the box with only minor tweaking. If you have to go with the cub, I'd recommend either the OS or Magnum 52 4 stroke, and get some help on the break in.