Mount the engine as far forward as possible What type of servo are you using for your throttle? If your using a mini or smaller type, consider going to a "full size" If all else fails, either go to a heavier four stroke or consider the stick on type of weights up front I too am buidling the Edge so keep me informed of your progress & problems you may have encountered Joe
PS Mine will have a YS 61 with a moose can pipe and all JR equipment