TO BE PERFECTLY FAIR>>>> I'm not bashing all evo engines...just the one I had an experience with and it looks like I have the backing of some others on this thread. I guess I was so disheartend by all the trouble I had because all the advertising promoting the Evolution 1.00NX .....said it was ready to fly ready to use right out of the box. Broken in at the factory and all carb adjustments preset...the buyer wouldn't have to do a thing except fuel it up and flip the prop. Nothing could have been further from the truth. It was all BS! I had ten times the trouble tuning it and keeping it going than any other brand of two stroke I've ever owned - about 40 of them. The only other brand I would say is troublesome would be the ASP brand, but I bought that one used...previous owner might have abused it...who knows...giving that one benefit of doubt.