I won't even try to comment on the technical side, or the comparison of the 150 2-stroke. But from experience with my kids and friends (12-13 years old), my 140 Suzuki on my 73 20SF pulls them just fine. Solas Amita 4 Blade 13.75X19 Prop.
However, no matter how much I try to squat the boat, the Seacraft hull is too efficient to make a big enough wave to satisfy my son and his buddies for wake surfing
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Lloyd