I have a 1993 2 stroke 225 Yamaha on a 20, transom is 27"- no problems
Also have a 1994 200 Mercury 200 (Black max 2 stroke) on a 20, 27" transom- no problems
Both motors are reported to weigh slightly over 400 pounds
I put a 150 Yamaha 4 stroke on a 20 for a friend, motor is raised one hole higher than above boats and this is the only SeaCraft 20 I've ever experienced porpoising on. Not sure if it is the engine height or weight causing this.
All of these boats have had the decks raised 2-3"
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