Yet another opinion:
While I generally agree with the "don't oversize the lower unit" perspectives offered, it may not be that simple. The big IF is this: If you intend to use a larger, more efficient propeller on the lower unit (and you should), you will end up with a steeper torque-vs-speed curve. You'll be delivering more motor power to the water as propulsion (as John mentions) at a slower prop speed and at a higher torque than the stock propeller was absorbing. Maybe it wouldn't be an issue, but only the outboard design engineers would know for sure. I went from a 10"x10" or so prop to a 12"x12" prop. Maybe an 8HP lower unit would work for me or maybe not. But what I have works.
My outboard was a 25HP 1980's M25B Tohatsu 2-stroke. I converted it to electric in 2003. I'm not much of a fan of electronic speed reversal and have been very happy to simply retain the mechanical reversing of the stock lower unit. www.evalbum.com/492
-MT
Posted by: "Myles Twete" <matwete@comcast.net>
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