1977 Evinrude 55 HP Outboards OMC Service Repair Manual P/N 5307, Page 51Get this manual

1977 Evinrude 55 HP Outboards OMC Service Repair Manual P/N 5307, Page 51

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then down and out the exhaust ports the adjacent side of the cylinder wallThe flow of the incoming fresh fuel laden gases very effectively "drive" the burned exhaust gases from the cylinderThis result

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