Yamaha Lower Unit Assembly - F225 - 6BB-45300-00-8D - See Description For Applicable ModelsYamaha Lower Unit Assembly Gearcase & Drive System F225 6BB 45300 00 8D Overview When youre running a bigger motor like the F225, the lower unit takes a lot of stress every time you throttle up. This assembly is built to handle that load, delivering smooth power from the engine down to the prop without hesitation. If your current unit is showing signs of wear or damage, swapping it out brings back that solid, dependable feel on the water. Its the kind