The boat has a 1984 Mercruiser I/O with a 140 hp (3.0L), 4 cylinder engine SN 6752683, sterndrive SN 6748519 (aka R/MR/Alpha One). The engine needed rebuild due to 3 out of 4 cylinders being out of spec on compression. This was performed over the winter of 2015/16 by a local Mercury shop. When...