This product has been superseded by: 68D-G5300-13-4D

Yamaha - Lower Unit Assembly - Gearcase Component - F4 - 68D-G5300-10-4D

Overview

The lower unit assembly is a vital component of your Yamaha outboard, responsible for transferring engine power to the propeller for smooth and efficient operation. Built with Yamaha’s precision engineering, this assembly ensures reliable power delivery, responsive handling, and consistent performance on the water. Its durable construction is designed to withstand harsh marine conditions, offering excellent resistance to corrosion and wear. Replacing a worn or damaged lower unit helps restore proper propulsion and keeps your outboard running at peak performance.

Key Features

• Complete Gearcase Assembly – Transfers engine power to the propeller for propulsion.
• Smooth & Efficient Operation – Supports reliable shifting and consistent performance.
• Durable Marine Construction – Built to resist corrosion and wear in harsh environments.
• OEM Yamaha Fitment – Designed to factory specifications for proper alignment and installation.

Engine & Boat Compatibility

Compatible with Yamaha F4 outboards using this lower unit assembly.

FAQ

Q: What does a lower unit assembly do?
A: It transfers engine power to the propeller and houses the gears for forward, neutral, and reverse operation.

Q: What are signs the lower unit needs replacement?
A: Grinding noise, vibration, shifting issues, or water contamination in gear oil.

Q: Will replacing the lower unit improve performance?
A: Yes, especially if the existing unit is worn or damaged.

Q: Is this a complete assembly?
A: Yes, it is a full gearcase assembly designed for replacement.

Q: Is installation difficult?
A: It typically requires mechanical experience and is often handled by technicians.

• Supersessions
  67D-45300-10-4D, 68D-G5300-11-4D, 68D-G5300-13-4D, 68D-G5300-13-4D