Futaba 3004 servos, Dubro heavy duty arms, 2000mAh 4.8v battery, stock landing gear and wheels, Sullivan tailwheel, and most importantly........the outstanding O.S. .61FX! Yakko........did you say you're having RELIABILITY problems with the O.S. .61FX? ( I must have misread your post.) What seems to be the problem? You're performing the "pinch test" aren't you? I've only experienced problems when doing outside loops.......it runs so exceptionally perfect other than that I don't bother with figuring out where in the fuel-delivery system the problem exists!