On my 1981 75 HP Evinrude how critical is this gasket, #25 in the attached photo. This gasket appears to be missing on my engine and it looks like a lot of work to replace it. If it is missing what would be the side effects? Incase the gasket # is not clearly visiable in the photo. It is the gasket that goes between the bottom of the base plate and the exhaust tube.
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