I guess a lot of how an engine runs and idles depends on how we tune it. I got a little SC46 for only USD60 and she is perfect, does not dead stick on me and runs well inverted. That SC is a lot cheaper than my TT46. I've seen guys who do not tune their engines properly and they are not hitting the max revs and their engines are too hot to touch when they have landed. What can we say ... of course there are some lemons.