Re: repower
The Suzuki 140 4-stroke will push a SeaCraft 20 (with a full 75 gallon tank and t-top) along between 42-44mph.
Not real sure what is meant by "enough" when used in conjunction with engine sizes, but you see SC20's for sale on boattrader with 90hp engines on them. Mine had a 130 on it when I bought it and it was VERY "enough". I suspect that a 115hp, at 15hp less, would get you up on plane and the fish would still bite. However, if speed is important, you should probably consider as much horse power as you can afford.
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