The motor is a late 90’s Mercury 25hp 2 stroke. I’ve owned it three years and changed the plugs once, about 40 hours ago, best guess. It started to idle a little rough and take a little more effort to start, so I bought some new plugs. Upon removing the old plugs, I noticed that the plug from the top jug, the center post electrode was worn completely off, just gone? The bottom cylinder showed normal wear, the gap being just little wide. Other than the above mentioned issues, the motor seems to be running fine. Any ideas what could do that to a plug?
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