4Stroke Question

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Now that each company in the motor industry is coming out with a large 4stroke engine (200,225, etc.), is it possible that they will figure a way to get the weight down around the same as a 2stroke model. In other words, will a 4stroke 225 ever weigh the same as a 2stroke 225. In a few years everyone will have V6 4strokes on the back of their Seacrafts because 2strokes will eventually die out. Someday I plan to put a bracket and twin 150's on the back of my Seacraft. My only concern is, how much will one of those 150 4strokes weigh (if in fact they come out with one)????