Zenoah/CY engines? What's the difference?

CY is a chinese company that produces good quality engines, similar in design to the popular and slightly more expensive Zenoah engines. The more expensive cars are often supplied with Zenoah engines, which run a bit smoother, develop a bit more power CC for CC. A Zen 26 should outperform (though not by much) a CY26. Once you start adding headkits though, it makes little difference which engine you originally started with. Evidence has been posted in the forums that the Zenoahs are slightly more aggressively ported from the factory, and that the porting is of better quality. I've even seen one site claiming that CY engines are superior, though I don't believe this for one second. Bottom line is that both are adequate engines, and apart from some very small differences, take the same upgrades/headkits/carbs, etc. Go Zenoah if ever given the option.