Yamaha Lower Unit Assembly - 6H3-45300-19-4DYamaha Lower Unit Assembly Gearcase & Propulsion System 6H3 45300 19 4D Overview A bad lower unit will take a solid running motor and turn it into a headache fast. Ive seen guys chase small fixes when the real issue was deeper in the gearcase, and at that point, a full replacement just makes more sense. This assembly takes the guesswork out and gets everything back in line where it should be. Once its installed right, youll feel the difference
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