I have a cs 46 on my kids trainer and other than the carb that I had to replace with an old k&b carb to get it to run right, it purs along quite well. I am using a 12x4 wood prop on it. The only grip I have about it is that it does not seem to want to flip start. I almost always have to use the starter cold or hot. Other than these two things it is a great engine.