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That's actually been part of my dilemma. It would be great to get the engine running and burn off (hopefully it's in there) any old fogger, then run the test. If there was no fogger and I spray some in, it's going to up the compression numbers and mask any issues that may be in there. If it was winterized and there's still fogger in there, it'll also up the numbers temporarily giving me a false reading....

If I remember correctly, when checking a car compression that's low, to see if it's the rings vs the valves, a little oil is added to the cylinder and the compression checked again. If the compression increases it's the rings and if it doesn't it's the valves. I assume any fogger oil in a 2 stroke would have the same effect?