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Your engine serial number comes up as an 1987, 20_HP, 'Parts Group: 18/20/25 H.P. (XD)I picked up a 20 hp Mercury outboard with no plate or sticker. The freeze plug had a number on it "B162749" How do I get information on this motor so I can get parts? I think it is a 1986 but I'm not sure. Actually, I'm not positive it is a 20 hp.