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Thanks for the clarification.
Today I once again bought some new plugs. Luckily I work at an auto supply store so I can check up on plugs while at work. 😀
We were out of NGK B7S and Champion J4C’s but I got Denso W22S-U:s . They matched the specs so I thought I’d give it a shot. Installed them, pulled the starter.. And off they went! Ran better than ever before, both the HD and the Sportwin. Which brings me back to the thought about the Bosch W8EC plugs being dodgy. But what is the chance that FOUR brand new plugs are bad?
The chance of four brand-new spark plugs – made by two entirely different manufacturers – being ‘bad’ out of the box is pretty slim. Of course, in a two-cylinder motor, all it takes is +one+ bad plug to make things go awry.
All I can tell you is that there most certainly +is+ an answer, and with the proper knowledge and instruments, it could more than likely be found. But I sure as heck can’t tell you, not from where I sit, way out here in the cheap seats.. 😉
And again, I’ve simply had crap luck with both Bosch and Champion, in all but a few previously-described situations. All plugs pretty much look & feel alike, but there’s some very serious and subtle science going on in those things.. a wide-world of trade secrets, I’d wager.