Rich,
Really cool!
If your remember last month I took a lathe to the plugs on my CR250 and the kids CR80.
The nose of both bike plugs look cleaner than your plug "D" and the CR250's plug ring is similar in color to "D" and starts approximately 1/16th above the metal base and is 1/16th thick where yours looks to be right at the base. The CR250 was running a BR8ES.
The kids CR80's plug has a very light tan ring that is right at the base and is a hair bigger than 1/32nd and looks just like your "D" plug with a white nose. That plug was a BR9ES. I did go one size larger on the main with the kids bike because is seemed to be lacking a little in top end.
Side note: Were these pix taken with a digital camera or with film and then scanned? I have access to a film camera and macro lens so maybe I'll get some pix of my plugs and we can compare notes.
Great addition to the forums no matter what!
Thanks!
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cr250john
Mine '00 CR-250 '95 Yamaha Virago XV-750
Kids '01 CR-80's