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Message: <blockquote data-quote="zuren" data-source="post: 484149" data-attributes="member: 22314">I followed Gypsy's advise and spent time at MarineEngine.com.  From what I could see, the block and pistons between a 1986 9.9 and 15 hp are not the same, leading me to believe that a conversion is not feasible, or at least not as simple as I would hope.  Then I found a comment in a forum somewhere that it is only the mid-1990s and later Merc 9.9s that can be converted.  So based on what I'm finding, I'm not convinced mine can be "easily" converted.I'm considering saving my pennies and looking into a Tohatsu 15-20HP.  At 94 lbs., it is heavier than my 70 lb. 2 stroke, but I'm looking to get my battery and trolling motor up toward the bow.  That may be enough for the extra 24 lbs. to work.</blockquote>