RE: J-3 Engine Choice?
Look around for a used Enya 60-4C or 80-4C. If you're a romantic and you love the sound of M.A.S.H.'s "Five O'Clock Charlie", the Enya four-strokes will make you smile, when ran unmuffled. They miss and sputter, but they almost never quit. I polled the folks at the flying field on whether I should buy a muffler for my Enya 80-4C or not (didn't come with one) and they all agreed that the sound that it did make was pleasant and enjoyable. I really miss that transparent red Monokote finished CGM Cub.
I do have a Saito .56 and a couple of Saito .82 engines to run-in. I'm looking forward to it.
Being an engine hoarder, as I am, long ago I found it wise to fit my models with the Edson Universal Adjustable Engine Mount, now being sold by RJL/MECOA. Thank you, Randy. Then you can put virtually any engine that you want on your models with a minimum of fuss. And no, they are not heavy. They just look heavy and they are nearly indestructible.
Ed, NM2K