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I missed that they had increased the transom height on the new 2018 170 Montauk II to 25". Aside from the extra engine weight from the longer shaft, that actually seems like another improvement over the previous Montauks.

So if the Merc 115 Fourstroke CT 25" shaft with prop and fluids is pushing the 410 lbs weight envelope, that would likely make it the only 115 on the market that will meet the weight spec for this new 170 Montauk II. (All the other 115s on the market are heavier.)