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    1984 yamaha 70 and 90 lower unit interchange

    Hello, My question is does a 1984 Yamaha 70 h.p. lower unit interchange with a 90 h.p. I have heard it does it looks like it will but I understand the gear ratios are different. The 70 h.p. being 2.33:1 and the 90 h.p. 2:1. Is this info correct ? and if so could that difference be made up with a...
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