I just checked Tower, they still sell the .91FX. The .91FX ways less than the .95AX and the .91 is (if I spell this rite, lol) scherley ported. Im prolly gonna get the .91 I hope its not gonna be to much though. The plane says .40 through .60 in 2 strokes and im gonna put a .91 Man thats a lil big. Just gonna have to be easy with the throttle. Guys im not gonna have to buy a perry pump are glow assist for this thing rite?