Yamaha - Lower Unit Assembly Complete Drivetrain Assembly 6P5-45300-10-NA. Overview. The Yamaha Lower Unit Assembly VZ200/VZ225/VZ250 6P5-45300-10-NA is what puts all that high-performance power into the water where it counts. When a lower unit starts going bad on these motors, you'll feel it right away-vibration, noise, or loss of push at speed. Instead of digging into internal gears, swapping the full unit is usually the most reliable move. It gives you a solid, ready-to-run setup so you can get back to running strong without second-guessing it.. Key Features. • Complete Drivetrain Assembly - Replaces internal gears and components in one unit for reliable performance.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and seamless installation.. • Smooth Power Transfer - Supports consistent thrust and dependable operation under load.. • Heavy-Duty Construction - Designed to handle high-performance engines and harsh marine conditions.. Engine & Boat Compatibili