Remove all that plastic off the plane , sheet and cover. You'll reduce the weight several ounces. The plastic is all hot glued on and will come off easy with a hot knife.
Mine has the OS.25FX w/3004 Futabas except the throttle which is a Futaba Hi-torque mini.
Flys a lot better after removing all the heavy plastic .

Had one with an OS .40 in it until the vibration shook the battery compartment loose which fell down on the aileron servo during a sharp turn. Just kept turning .