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My sled started running real bad, 200 miles on it. I thought I may have damaged the reeds with an over rev but they are perfect. While in the area noticed alot of oil from spark plug holes, I have not touched the spark plugs in the machine. I found that they had backed out about 1.5 revolutions, so I removed them and found one of them the porcelain had came loose and slid down eclosing the electrode tip and insulating it from the ground tip. No way it could fire, tried to upload a pic but couldn't. By the time I got to the trailer the thing would not even start. I've never seen a plug fail like this? Has any had this situation??