Yamaha Lower Unit Assembly - F225 - 6BB-45300-01-8D - See Description For Applicable ModelsYamaha Lower Unit Assembly Gearcase & Drive System F225 6BB 45300 01 8D Overview When you're running an F225, you need a lower unit that can handle steady load without hesitation. This assembly is built to deliver smooth, consistent power from the engine down to the prop, whether you're cruising, fishing, or running offshore. If your current unit is worn or damaged, this is the kind of replacement that brings everything back to how it should feel on