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I don't think the weight of the jack plate is the problem, it's the distance from the transom that you're mounting the motor. Boston Whaler didn't design that transom to sustain that kind of leverage. If you used a one pound jack plate that sat a 100 pound motor back a hundred feet it would probably break the transom off. I would get rid of the jack plate and mount the motor in the manner for which the boat was designed.