Honda and Yamaha have numerous deals with China for having their designs built there. In part because the Chinese would just buy one of whatever engine, disassemble and then build castings of all the parts. With or without the authorization to build the clones. So the Japanese companies took what deals they could to get something for their old designs. The newest Westinghouse 2500 watt units use a copy of the same Honda engine design from the 2000i. A 98 cc horizontal shaft engine from 30+ years ago.
China's materials, read that as base metals are still lacking, just as Japans were in the 1970' and 80's. The Chinese still cut some corners on QC to get production up and going, but they are improving the same way the Japanese did 50 years ago.
Currently China builds huge numbers of motor scooters and small motorcycles, based on licensed Honda and Yamaha clones. The quality is only lacking in that they cut a few corners on cleaning and occasionally on materials. Materials are improving, as the idea of doing an oil change yourself, to save $400 or more sinks in, in American and European heads, the number of Chinese company cloned products will gain more acceptance in our markets.