My Craftsman YT3000 mower uses spark plug #RC12YC as I have confirmed on the sticker under the hood. This spark plug was installed well, but when I lit it the engine boiled over. After some research, it became clear that the problem was with the spark. I then installed the second spark plug from that kit in case the first one was bad and also spattering. I then fitted the original spark plug I was planning to replace (which still worked, just the old one) and the engine ran fine.
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