I love the kit, I am actually thinking about getting another one and really building it light. Mine was stock until a heavy landing took the gear rails out. I beefed the area up and moved the gear about 3/4 of an inch forward, put blind nuts and nylon bolts in to shear off instear of taking the bottom out again. I also recommend shimming the aft of the landing gear. Try a 13-8 Symitar prop on your .91 4 stroke. I had a 14 -6 and the 13 - 8 makes that baby come ALIVE... good luck and enjoy