I remember reading that Rotax 912 ULS engines were to have a minimum RPM of 5200 at climb out so as not to over load the engine or cause detonation. I don't see this anymore in the Operators Manuel or SL 912-016 which just mentions octane requirements and manifold pressures. My RV12 gets about 5150 rpm at VY which to me is close enough. I wonder if they got off that requirement?