I have one and after working with it for a while now, figuring out its idiosyncracies I am right on the edge of flying it. I have it in a plane and I almost flew it today, but my allergies got the best of me, so i didn't try flying it today. having a sneezing episode while flying a airplane is not a good experience to have. Noty just one or two sneezed but more than ten or twenty sneezes and then the eyes start to get all watery and swelling up on me too.

here are pics of mine

























I measured about 357 degrees F at the base of the spark plug on the head after a fairly long full throttle engine run on the test bench using a APC 11x6 prop. At the flying field using a Master Airscrew prop I measured about 330 degrees F. The back of the cylinder just below the head measured about 200 degrees F and the muffler about 1 inch or so away from the engine measured about 400 degrees F,