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I have a 1979 v20 that I'm restoring.im almost to the point of re powering it .i want to put a 4 stroke on it but I've been told that most of the 4 strokes are to heavy for it.is that true? I don't want it to sit with the transom too low. Any suggestions on a good motor for that boat? I've been looking for a Yamaha f150 4 stroke but seems impossible to find