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Mariner

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I have a 1985 15ft bass boat. It has a 75 Mariner on it.  The engine has always run very good. But i have been blowing the third spark plug from the top from time to time.  It is the only plug that blows. Does anyone have any ideas about this. Like i said it runs great 99 percent of the time. Oh it is a 2 stroke.

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