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Grabbing the thread a bit here, but I'm wondering about going down in power.

We have a 50 horse Yamaha on out S/Sport 15, which I assume is the original motor circa 1989. Whilst there's nothing wrong with it apart from the usual heavy fuel consumption of a 2 stroke (starts easily, runs fine if a little unhappy at low harbour speeds etc), it is a bit old and I have the chance of a Yamaha 25 4 stroke in very nice order and to the right spec. at a good price.

No idea how fast the boat will go as I've never had it to WoT, but it sees 25kts very easily with 1 or 2 aboard. Boat only used for fishing and as a runabout, so speed and power not too important, but I wonder nevertheless whether I'll find it 25 hp adequate. I'm sure it will be happier at low speeds; our harbour has a 4kt speed limit amongst the moorings.

Any thoughts, anyone ?