Yamaha Lower Unit Assembly - 25 - 6L2-45300-13-4D - See Description for Applicable ModelsYamaha Lower Unit Assembly Outboard Drivetrain 6L2 45300 13 4D Overview When a 25 horsepower Yamaha starts feeling off, the lower unit is usually where the problem shows up first. Youll hear it in the shift or feel it in the way the boat runs. This is the kind of replacement that brings everything back to smooth, predictable performance. It bolts up clean, runs quiet, and gives you that solid feel you want when youre out working or just enjoying the