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if the kids are putting around the harbor a 9.9 will push it around fine and with two small kids will probably get it on the step but not get in any trouble and be legal. Wth one or two adults it will be a dog! In my mind a 25 is a tad short on power. I have a 2 stroke Ev 30 that runs like a champ but I would not be happy with much less power. A 40 (2 stroke) would be my choice if I was money bags
In addition I have a 1969 slapper and you have a "new" hull with I think a deeper v hull...maybe...if so it requires more powerr than the olderr flatter bottom sports.
I would stick with what I have, and spend a little bit of money on a VHF, and Sea Tow (since it's available to you out there). You will be miles ahead in the money department.
The mid 80's to 90's Evinrude's were some of the best engines made, I would run the engine until it dies, then purchase at least a 30 like Blake has... You will not be sorry...take care