Yep, a 4 stroke in my J3 would be real nice-at about triple the price of a good 2 stroke up here in Canada. My OS 46 2 stroke with Pits muffler sounds very sweet and has been a great motor in this plane. Hek, I'm even gonna put a super reliable inverted 2 stoke in my new Tiger Moth. I have nothing against 4 strokes except the price and have an OS 52 in my Smith Mini Plane and a Saito 65 in a Fleet Finch. But I think they would still fly great with a good 2 stroke. To each his own , I guess. Oh, and myb J3 Cub seems to get better all the time. I'm trying to figure out how a 2 stroke would RUIN!!! the plane.