You're gonna need a new 2 blade spinner. The flywheel messes up the backplate a bit, but mine works fine. I have the XE2 with the same engine you have. When you tighten down the prop. nut it will warp the backplate a tad, but just screw the spinner on, get both sides tight, and straight, and you should be fine. I have a 10X7 MAS prop. on mine, and my friend has an 11X5 APC on his H9 Alpha. His plane is FAST with the 11X5, so I wouldn't reccommend it with yours just yet. Marc. slipped with the electric starter the night I got my plane, and broke the 3 blade prop, so I started out with a 2 blader. No problems for me. Good luck!