Re: cleaning spark plugs
I remember seeing information many years ago about cleaning sparkplugs by sand-blasting them. (Remember the old spark plug cleaner machines?) Don't know if the same situation with bead blasting, but the amount of blasting media left on the plugs, even after blowing them off with compressed air was significant. Eventually that would get back into the engine with unwanted abrasion now taking place to the cylinder. The recommendation was to NEVER blast the plugs to clean them. Replace them instead.
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