[Weldangrind]

I think what the Chinese site is saying is that Jianshe and Yamaha have a relationship. I'm pretty sure your quad is cloned from a Yamaha, so now you just need to figure out which one.

I once saw that on the trails, where I met two guys riding quads. One had a Yamaha Bruin, and the other was riding a clone of a Bruin. I crawled all over those machines, and I only found two differences: The clone had four headlights instead of two, and the Yamaha had some sort of switch in the side of the engine (presumably a low-oil shutdown), but the clone was not drilled for the switch. That was all I could find to be different. The body shape, frame design, suspension, winch mount and controls were all identical.

When you find the Yamaha that your quad is cloned from, you might be able to use Yamaha parts or aftermarket stuff designed for a Yamaha.