Ray, I have been doing some compression testing . My rotax was at 150 pounds cold in Grand junction. It tests less with less air density like at my shop. I tested Norberts Pavesi after a fresh piston and ring at SBR and got a weird low reading , even tried a different gauge and still got a low reading while it ran great on track.
I am finishing up my shifter motor rebuild and will be doing a low pressure 10 pound leak down test on the bottom end just to see how the case gasket and seals perform.