I have a SC 20 MA which I repowered with a 150 Etec - It has more power then needed.
The majority of the time I comfortable cruise around 28 - 32 mph, in bumpy seas 14 - 18mph. I rarely use full power and speed.
The less weight on the transom the better - weight savings between 115 and 150 engines are around 80 lbs plus or minus - less water coming up thru the scuppers - the ability to get up on and stay on plane in the slop for a comfortable ride is more important to me than the rare occasion when the wind whistles around my ears at a higher top speed.
My marine mechanic and others tell me the 115 hp engine is a great fit for the SC 20 hull - sips fuel.
I would go with the 115 hp outboard next time around.
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