Colin, I never heard of a weld failure on a scooter, and only a few incidents on dirt-bikes and owners admitted that they were jumped.
I agree that with some brands, wiring and and general assembly can be problematic - loose or cross-threaded bolts, no grease in joints, bad crimp joints, improper vacuum/fuel line routing, bad hoses and connections, air bubbles in brakes and coolant, etc.
Your experience will depends on the brand and who you are buying from, but most major Chines OEMs have pretty good QC and components (CFMoto, JMStar, Linhali, Lifan, Zongshen, QingQi, Shinray, etc). The problem is private label importer - they seem to have zero interest in preserving they reputation and always go to the lowest bidder, specing bottom-end compomnents. The only exception for private label that I know of is Qlink.
Ross
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