We know what would make a good engine. Even they know what makes a good engine. They have sold their samples of some of the finest engines ever made on Ebay over the past couple years. Rossi, OS, Rivers, Oliver, to name a few. There was an Ebayer from China selling some very nice engines. I had hunch this was the CS factory. A few months back they started selling CS engines. They are very aware of what makes a good engine. What appears a simple choice to you or me is not the same over there. That's why you find toxins in baby formula produced in China and doing such a thing would never cross anyone's mind in another part of the world.