Yamaha - Lower Unit Assembly - Gearcase & Power Transfer - 64E-45300-23-8D

Overview

On these Z200 setups, the lower unit really takes the load, especially if you’re running offshore or putting in long hours. I’ve seen them start to get noisy or lose that clean shift feel, and at that point, it’s time for a full swap. This assembly brings everything back to smooth, tight operation without chasing internal issues. Once it’s on, you’ll feel that solid engagement and steady push right away.

Key Features

• Complete Gearcase Assembly – Includes internal gears and housing for a full lower unit replacement.
• Smooth Power Transfer – Delivers consistent engine output to the propeller.
• Heavy-Duty Construction – Built to handle high horsepower loads and demanding marine use.
• Reliable Gear Engagement – Provides clean shifting with reduced noise and vibration.

Engine & Boat Compatibility

Z200TXR – 2011-2012

FAQ

Q: What are signs my lower unit is going bad?
A: Grinding noise, slipping gears, water in gear oil, or rough shifting are all common indicators.

Q: Can I keep running if the lower unit is making noise?
A: It’s not recommended—damage can get worse quickly and lead to complete failure.

Q: Do I need to check gear oil before using this unit?
A: Yes, always confirm it’s filled to the proper level before running.

Q: How does saltwater affect this lower unit over time?
A: Salt can cause corrosion and wear, especially around seals, so regular flushing helps extend its life.

Q: Is installation something I can handle myself?
A: If you’ve done lower unit swaps before, it’s manageable, but proper alignment and torque are important.

• Supersessions
  64E-45300-20-8D, 64E-45300-21-8D, 64E-45300-22-8D, 64E-45300-24-8D, 64E-45300-24-8D