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Message: [QUOTE="keithb7, post: 881811, member: 58846"] I see that there are some real experts on engines here on this site. I have a question to post. Spark plug fouling. What exactly happens here? Breaking it down to basics, the plug electrode and insulator get coated in oil deposits and soot. So if I take it out and sandblast it like new, regap and reinstall it, why won't it perform as well or as long as a new plug? What is wearing out there? I understand heat ranges but this fowling is stumping me. A good sandblasting or glassbeading really, really gets the plug looking like new again. My son's 1976 Honda Z50A is really picky about fouled plugs. New plugs or, forget it, it won't start worth a darn. And it's a four stroke! But finiky, I tell ya, as bad as a 2 stroke. Keith [/QUOTE]