I live and work in an Engineering environment in mainland China and I have been watching with interest the comments regarding China manufacturing quality.
As the Director of Engineering for a western owned company, I have to deal with local Chinese manufacturing companies every day.

Please take it from me that when a Chinese factory sources materials to produce something, they will find the absolute cheapest material they can lay their hands on to do the job. It may look the same on the outside, but trust me, it is nothing like what you would find from a Japanese supplier.

A lot of Chinese motorcycles are made using tooling that was purchased from Honda or Suzuki when they stopped manufacturing that particular model (or when it had finished it's life cycle) and then copied in order to make locally made Chinese products.
Now you may think that you are buying a Honda CB125 model with a different badge on the tank, and I've seen probably 20 different makes of bikes which all look like Hondas or Suzukis, but that's where the similarity ends.

Also for your information, don't even think of ever buying a used bike from China which has been exported. I have been living and working here for 5 years and I have NEVER seen any bike which after it has left the showroom has not even been cleaned EVER! They certainly NEVER get any maintenance whatsoever. This goes for anything. Motobikes, schooters, bicycles...everone is absolutely filthy dirty, rusting, and generally completely uncared for.

I hope this helps.