Check out the cg. I had one with a 46 and it flew just fine but it would snap on landings. I put a 4 stroke in just because a cub needs a 4 stroke()and it stopped. I think that the cg in the manual is wrong. balance it a little nose heavy. if it already is, add more to the nose. Ine of my best flying planes I have.
Hardcoreflyer