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This is pretty disturbing. I’ve been a heavy NGK user since owning and working on Yamaha motorcycles in the early 70s. They also turned out to be an improvement over the OEM Bosch in VWs and BMWs of that era. I’ve used them very successfully in my outboards and have bought several motors with NGKs installed by dealers so I’m not the only one.
The problem is that the Made in Mexico Champions are junk. I’ve had way more than a couple stop working in the first few hours of use. They won’t get any more of my money for those. I discovered the chainsaw lengths are usually made in USA and since their heat range numbers match the longer plugs they’re perfectly acceptable as replacements. An added bonus is on some of our motors the extra clearance is an advantage. I pick them up in the clearance shelves of the big box home improvement stores for 1/2 price or less off season. I also now carefully inspect old plugs that find their way to me and I no longer pitch the old -J plugs unless they’re really nasty.
Another choice I’ve really been happy with are Autolite. Tried some when the local Advance didn’t have NGK and they are still doing great.