Knowing how hard is to get used bike in good condition, with all paperwork and so on, I am considering buying something cheaper, made in China. Still, I would prefer to get Japanese bike, but maybe its worth giving a Chinese bike a go. I found on Taobao a bunch of decent looking bikes but wondering if they are actually worth any interest. Has anyone had any experience, issues, or information with bikes below?

https://item.taobao.com/item.htm?spm...id=45710141024 - tonnes of similar looking bikes at around same price

https://item.taobao.com/item.htm?spm...id=45768398905

What engine would be the best here? 150,200,250? air / water cooling?