Yamaha - Lower Unit Assembly 150/200 HP - Drivetrain Component - 64D-45300-22-8D

Overview

When a lower unit starts wearing out on these 150 and 200 horsepower Yamahas, you’ll feel it right away—rough shifting, vibration, or loss of clean power to the prop. This assembly is built to bring everything back to smooth, reliable operation with proper gear engagement and steady performance. It’s designed to bolt up clean and run true, whether you’re running long days on the water or just getting out on the weekends. Once installed, you’ll notice better control, smoother handling, and a more responsive ride.

Key Features

• Smooth Power Transfer – Delivers consistent propulsion from engine to propeller.

• OEM Yamaha Fitment – Designed to match factory specifications for precise installation.

• Heavy-Duty Gearcase Design – Built to handle demanding use and mid-to-high horsepower loads.

• Corrosion-Resistant Construction – Holds up in both freshwater and saltwater environments.

Engine & Boat Compatibility

• Compatible with Yamaha 150-200 HP outboards

FAQ

Q: What are signs the lower unit needs replacement?
A: Grinding noise, slipping gears, or water contamination in gear oil are common signs.

Q: Can I rebuild instead of replacing it?
A: Minor wear can be repaired, but major internal damage usually makes replacement more reliable.

Q: Will this improve performance right away?
A: Yes, smoother shifting and better power delivery are noticeable after installation.

Q: Is this suitable for saltwater use?
A: Yes, with proper flushing and maintenance, it performs well in saltwater.

Q: Has this part been updated or replaced?
A: Yes, it has been superseded by part number 64D-45300-23-8D.

• Supersessions
  64C-45300-20-8D, 64D-45300-20-8D, 64D-45300-21-00, 64D-45300-21-8D, 64D-45300-23-8D, 64D-45300-24-8D, 64D-45300-24-8D