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My 2 cents...
I think this plug failure thing just may be bad luck as much as anything else. I had a bad (old)NGK plug in my 650 and darned if I didn't get 2 brand new NGK replacements that turned out to be bad...the only time I've ever in 47 years of motorcycling had a brand new plug that was bad, let alone two!. I still use NGK plugs anyway, I don't expect lightning to strike in the same place 3 times though Murphy's law says that if something can happen, it will. Plug life is also a function of how well your bike is jetted and runs. My XJ750RH always had perfect plug readings. I ran one set of Champions for about 40,000 miles, checking and regapping periodically, until the electrodes were too short to get the correct gap. Even so the bike was running great when I changed them out for IIRC NGKs. I'm running NGKs now not because I have a preference but because they're what's readily available where I live. Have them in my '87 Chrysler 318" V8 too.
I think this plug failure thing just may be bad luck as much as anything else. I had a bad (old)NGK plug in my 650 and darned if I didn't get 2 brand new NGK replacements that turned out to be bad...the only time I've ever in 47 years of motorcycling had a brand new plug that was bad, let alone two!. I still use NGK plugs anyway, I don't expect lightning to strike in the same place 3 times though Murphy's law says that if something can happen, it will. Plug life is also a function of how well your bike is jetted and runs. My XJ750RH always had perfect plug readings. I ran one set of Champions for about 40,000 miles, checking and regapping periodically, until the electrodes were too short to get the correct gap. Even so the bike was running great when I changed them out for IIRC NGKs. I'm running NGKs now not because I have a preference but because they're what's readily available where I live. Have them in my '87 Chrysler 318" V8 too.
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