Newbie needs to know. I recently purchased a new RTF Xtra Easy 2. No where in the instruction manual does it indicate the size of the Evolution engine. In reading a review on the model it was stated to be a 40 Evolution. While reading some threads others have referred to it as a 46. The castings do not indicate a size. The head has an alpha symbol but no other identifiers. This is a trainer engine with a flywheel and carb adjustment limiters. Can someone enlighten me as to what the engine size is and what two bladed prop. would be appropriate for it?