Yamaha - Lower Unit Assembly - 99999-03364-00

Overview

The Yamaha Lower Unit Assembly | 99999-03364-00 is a genuine original equipment manufacturer component designed to deliver efficient power transfer from the engine to the propeller. This assembly plays a critical role in your outboard’s drivetrain, ensuring smooth operation, responsive handling, and reliable performance on the water.

Built to handle demanding marine conditions, the lower unit assembly supports consistent propulsion while protecting internal gears and components. Over time, wear from friction, impact, and corrosion can affect performance. Replacing your lower unit with a genuine Yamaha assembly helps restore optimal functionality and ensures long-term durability.

Key Features

• Genuine Yamaha Original Equipment Manufacturer Assembly – Manufactured to Yamaha specifications for precise fit and dependable performance.

• Efficient Power Transfer – Delivers smooth and consistent propulsion from engine to propeller.

• Precision Engineered Design – Ensures proper gear alignment and seamless integration.

• Durable Construction – Built to withstand corrosion, impact, and harsh marine environments.

Compatibility

Compatible with select Yamaha outboard engines that utilize this lower unit assembly within the drivetrain system.

Why is this prop a strong choice vs. alternatives?

• Original Equipment Manufacturer Yamaha Fitment – Designed specifically for Yamaha outboards.

• Maintains Optimal Performance – Supports smooth handling and efficient propulsion.

• Restores Drivetrain Reliability – Ideal replacement for worn or damaged lower units.

• Built for Long-Term Durability – Engineered for both freshwater and saltwater use.

FAQs

Q: What does a lower unit assembly do?
A: It transfers power from the engine to the propeller while housing gears and drivetrain components.

Q: Why is the lower unit important?
A: It ensures smooth propulsion, proper gear function, and overall engine performance.

Q: Is this a genuine Yamaha component?
A: Yes. The 99999-03364-00 is a genuine Yamaha original equipment manufacturer lower unit assembly.

Q: What are signs of a failing lower unit?
A: Common signs include unusual noise, vibration, difficulty shifting, or reduced performance.

Q: Can this assembly be replaced during major service?
A: Yes. It is typically replaced when significant wear or damage is identified.

• Supersessions
  69J-45300-30-8D