I used to work on big freight hauling trucks for many years. WE had ordered 3 rebuilt cylinder heads for for a Cummins inline 6. I pulled one out of the box and found a valve keeper missing. If someone would have installed that head and not noticed, it would most certainly have dropped a valve right quick. I'd take photos of that thing and get ready to email them. I've seen a lot of piss poor new parts, and rebuilt too. Like parts from the oldest of the two US motorcycle makers. Parts that make you wonder if a blind monkey might be doing the quality control work. It ain't only Dong Fang.