I wouldn't sweat it at all. Even Kohler sources their Courage series pushmower engines from China. I've personally had excellent luck with Chinese OPE engines. I have a 6.5hp on a ~3500watt generator that runs like a little gem. Also have a little quad for my kids that has a 110cc Honda knockoff. Overall the quad is light/junky, but the engine runs like a Swiss watch.
Joel