I had a '08 yamaha F150 on my old waterlogged '78 20SF. She definitely sat a little stern heavy, would porpoise a bit before getting on a plane, and needed to stay in the mid-high teens to keep on a plane. top end speed was about 40kt.
Ive since ripped a couple hundred pounds out of the boat during my restoration and am trying to decide to what to repower with. I too have concerns with the DF140 not being enough power. ive been considering the mercury 200 (475 lbs). i know the old guard will say thats too heavy, but i've moved my tank forward a little over a foot, slid the console/LP forward 4 inches. also its no exaggeration to say i pulled 250 pounds of soaking wet foam out of the aft end of the boat. im hoping all this will allow for a heavier outboard
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