I have had pretty much the same issues. I'd spend more time chasing down parts via the web than I was diagnosing and repairing a machine. I'm done working on Chinese machines. I have one more Chinese machine in my shop, a DuriFuel generator, and when it is gone there will be no more. It needs internal engine parts, specifically an exhaust valve spring, the retainer, and the 2 retainer locks. It has been a miserable task just finding the part numbers and then finding a retailer that had them in stock. If it looks like a Honda but doesn't say Honda on it anywhere, take it to someone else because I'm not working on it.