The Saito .65 is a very popular choice with the Sig 1/5 J-3 Cub. That's what I've got also. I've noted that a number of people go even larger with the clipped wing version and I imagine they might want to do so with floats but I've no experience in that regard. It's a great combo however. BOL and enjoy. I really liked the kit and the build. Hope you do too.