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    Yanmar KM4a gearbox ratio

    I have a 43' yacht with a I have a 43' yacht with a 4jh2e and a KM4a gearbox. The engine was fitted in around 1994 but I don't have any paperwork. I want to fit a new feathering prop but need my gearbox ratio for correct sizing. Is there anyway I can ascertain the gb ratio from the serial...
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