Fouled my first plug today (too much lugging around maybe, or rich low speed circuit?) and I accidently tossed a CR8E in my gear bag, although I another stock plug. The CR8E is the same dimensions and identical in appearance. It is what I run in my FZR600. I tossed it in, and ran it back to the truck through about 10 miles of sand dunes, mostly rolling hills. Question is, what did I hurt, or can I run this plug? The stock Denso U24ESR-N is fouled. Can anyone give me a background on plugs, and the like? Thanks.