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Message: <blockquote data-quote="onthewater102" data-source="post: 417220" data-attributes="member: 13702">The only difference between the 93 20hp and 25hp was the carb...it isn't like a Johnson/Evinrude where they had different intake plenums that needed to be swapped along & others that have different exhaust ports etc...mercury just built a 25hp and then slapped a restricted carb on it & lowered the WOT RPM rating (because it would be running too lean with the reduced fuel/oil supply from the smaller carb) and called it a 20hp.Take your serial # and pull up the parts schematic on any website that uses OEM diagrams (marineengine.com, boats.net etc.) and you'll see what I'm talking about if you haven't already.</blockquote>