Hssk50 with the big valve, thick rings. Ported intake and exhaust, using a PZ20 jetted up to #92. Plug has a few hours mostly riding mid to full throttle. Open pipe exhaust.
No expert here, but I would think it could be a little fatter. All of my stuff runs pretty good and when I look at the plugs they look a lot darker and more loaded up than yours.
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