I have a 2000 Yamaha F100 at 369lb on my 20 foot master angler. I think the 18 is a shortened 20 footer?
It pushes the boat to 33MPH with a 4 blade 12-3/4 x 17" Solas Amita stern lifting prop. I think the newer 2003 and up Yamaha F90 is the same motor and the same weight. It also doesn't terrify me when I stand in a back corner of the boat, becasue it isn't that heavy. It also gets 5 MPG or thereabouts. I see the 99-2003 carbed versions go for $1000 used up here, so something like that might be a good option.
Fr. Frank talked me into this setup and I am happy with it.
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