Patrick, how quickly did the cylinder foul the plug?? There are two avenues here if it is rings... Rings actually burned up or broke, OR the ring lands let loose. I have had lands break N/A and S/C so if it fouled very quickly, literally less than 5 mins of idling, I would imagine the ring-lands are broken and you may be in for a new piston along with those rings... Just a heads up
Tom
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