Yamaha - Lower Unit Assembly 200-225 HP - Drivetrain Component - 66K-45300-12-NA

Overview

When a lower unit starts slipping or taking on water, you’ll feel it fast—especially on these bigger V6 setups. This Yamaha lower unit assembly is built to bring back solid, dependable power transfer and smooth shifting on 200 and 225 horsepower outboards. It’s the kind of replacement you go with when you want everything lined up right and running like it should. Once it’s on, the difference in performance and handling is immediate.

Key Features

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

• OEM Yamaha Fitment – Designed for exact alignment and reliable installation.

• Heavy-Duty Gearcase Design – Built to handle higher horsepower and load demands.

• Corrosion-Resistant Construction – Holds up in harsh marine environments.

Engine & Boat Compatibility

• VX200 2004-2005
• VX225 2004

FAQ

Q: What are signs a lower unit needs replacement?
A: Grinding noises, slipping gears, water in gear oil, or poor shifting are common indicators.

Q: Can I repair instead of replacing the lower unit?
A: Sometimes, but major internal damage usually makes full replacement the better option.

Q: Is this suitable for high-performance use?
A: Yes, it’s designed for larger horsepower engines that see heavier loads.

Q: Do I need to check anything after installation?
A: Always check gear oil, alignment, and shifting before running it hard.

• Supersessions
  66K-45300-10-NA, 66K-45300-11-NA, 66K-45300-13-NA, 66K-45300-13-NA
• Engine Application
  • VX200 - 2004 to 2005
  • VX225 - 2004