Yamaha Lower Unit Assembly - VF90 - 6HK-45300-10-NA - See Description For Applicable ModelsYamaha Lower Unit Assembly VF90 Complete Drivetrain Assembly 6HK 45300 10 NA Overview The Yamaha Lower Unit Assembly VF90 6HK 45300 10 NA is what puts your engines power to work where it mattersbelow the waterline. When a lower unit starts acting up, youll feel it fast with vibration, noise, or loss of performance at the prop. Instead of chasing internal issues, swapping the full unit is usually the most reliable way to get things back on track. It