This product has been superseded by: 6BG-45300-12-8D

Yamaha - Lower Unit Assembly - Gearcase & Drive System - F30 - F40 - 6BG-45300-10-8D

Overview

When your lower unit starts giving you trouble, it’s not something you can ignore for long. This Yamaha lower unit assembly is built to bring back smooth, reliable power transfer so your motor runs the way it should. Whether you’re cruising, working the boat, or just getting out on the water regularly, having a solid gearcase underneath makes all the difference. It’s a dependable replacement that gets you back to confident, trouble-free operation.

Key Features

• Complete Gearcase Assembly – Restores proper power transfer from engine to prop for smooth operation.
• Corrosion-Resistant Build – Designed to handle both freshwater and saltwater environments.
• OEM Yamaha Fitment – Engineered to factory specs for proper alignment and performance.
• Direct Replacement Unit – Ideal for replacing worn or damaged lower units with minimal guesswork.

Engine & Boat Compatibility

• F30
• F40

FAQ

Q: What are common signs a lower unit needs replacement?
A: Grinding noise, difficulty shifting, vibration, or water in the gear oil are typical indicators.

Q: Is this a complete lower unit assembly?
A: Yes, it’s a full gearcase assembly designed for direct replacement.

Q: Will replacing the lower unit improve performance?
A: If the existing unit is worn or damaged, this will restore smooth operation and efficiency.

Q: Is installation something I can do myself?
A: It can be done with experience, but many prefer having a technician handle the install.

Q: Has this part been updated?
A: Yes, it has been superseded by part number 6BG-45300-12-8D

• Supersessions
  6BG-45300-11-8D, 6BG-45300-12-8D, 6BG-45300-12-8D
• Engine Application
  • F30
  • F40