Yamaha - Lower unit assembly - F225 - F250 - F300 - 6HB-45300-02-8D - See Description For Applicable ModelsYamaha Lower Unit Assembly Complete Drivetrain Assembly F225 F250 F300 6HB 45300 02 8D Overview The Yamaha Lower Unit Assembly 6HB 45300 02 8D is what takes all that horsepower and actually turns it into push in the water. When something inside the lower unit starts going bad, youll feel it quickvibration, noise, or a drop in performance when you get on it. Instead of tearing into gears and hoping for the best, swapping the full assembly is usually