Yamaha - Lower Unit Assembly - Gearcase & Propulsion System - 6EE-G5300-10-4D

Overview

When a small motor like an F4 or F6 starts losing smoothness or making noise down low, it’s usually the lower unit telling you something’s off. I’ve worked on plenty of these smaller Yamahas, and swapping in a complete assembly is often the cleanest fix. It saves time and gets everything back in line without chasing individual parts. Once it’s on, the motor runs quiet and pushes like it should again.

Key Features

• Complete Gearcase Assembly – Provides a ready-to-install solution for quick and efficient replacement.
• Smooth Power Transfer – Delivers consistent torque from engine to propeller for reliable operation.
• Compact Durable Design – Built to handle load and use in small outboard applications.
• Corrosion-Resistant Housing – Designed to withstand freshwater and saltwater exposure.
• Precision Yamaha Fitment – Ensures proper alignment with driveshaft and shift components.

Engine & Boat Compatibility

Designed for Yamaha F4 and F6 outboard engines requiring a complete lower unit assembly. Commonly used on small boats, tenders, and portable outboard setups. Suitable for freshwater and saltwater environments where dependable propulsion and ease of operation are important.

FAQ

Q: Is this lower unit still current or has it been updated?
A: This version has been superseded by a newer part number, which is typically recommended for replacement.

Q: What are signs the lower unit is going bad?
A: Noise, vibration, poor performance, or water in gear oil are common warning signs.

Q: Do I need to break in this lower unit after installation?
A: Yes, it’s best to run it easy at first and avoid heavy loads for the first few hours.

Q: Any tips for installing this assembly?
A: Make sure the driveshaft and shift shaft align properly and don’t force the unit into place.

Q: Should I replace the water pump at the same time?
A: Yes, it’s a smart move while everything is apart to avoid future maintenance.

• Supersessions
  6BX-G5300-10-4D, 6BX-G5300-11-4D, 6EE-G5300-10-8D, 6EE-G5300-11-8D, 6EE-G5300-11-8D