for a 4 stroke in the YS area i would half to say the .63. that is the best choice as far as YS goes. thats what i am flying on my funtana. a saito .72 or .91 would be good too, i personally think the 100 as a tad bit to much. i think the 61fx with 3d it. i dont know for sure but i think it will.

Kyle