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I'm in the 15' with 90hp process right now.
When I pulled off the 70 Evinrude I found a half rotted transom, I just finished with a "SEACAST" retro and it's very strong. If the transom had been OK I would of still hung the 90 as planned. The Whaler 15 can deflnitely handle 20 more horses, especially with a Yamaha 90, 261-lbs, it only weighs 11 pounds more than a OMC 70 which origlnally this boat was rated for. I'm sure my Seacast transom could handle a V-4 now, but she would sit too low in the water. My Yamaha will mount to a 5" manual jackplate, battery and fuel moving forward.
I'm at a point that she's ready to put together!