Yamaha - Lower Unit Assembly - Drivetrain System - 6E5-45300-17-8D

Overview

When a bigger Yamaha like a 115 or 130 starts having lower unit issues, you feel it right away—noise, rough shifting, or just not running as smooth as it should. At that point, rebuilding can turn into a long process with mixed results. I’ve found that going with a complete lower unit assembly like this saves time and gets you back on the water with confidence. It’s the kind of fix that brings everything back to smooth, dependable operation in one shot.

Key Features

• Complete Bolt-On Assembly – Comes ready for installation to minimize downtime and simplify replacement.
• High Load Gear Performance – Designed to handle the torque and demand of mid-range outboards.
• Corrosion-Resistant Build – Built to stand up to saltwater use and harsh marine conditions.
• Factory-Matched Fitment – Aligns properly with Yamaha drivetrains for smooth operation and reliable shifting.

Engine & Boat Compatibility

Designed for Yamaha 2-stroke outboard engines in mid-range horsepower classes using standard lower unit configurations. Commonly used on center consoles, bay boats, and larger fishing setups.

FAQ

Q: What are signs this lower unit needs replacing?
A: Grinding noise, slipping in gear, or water in the gear oil are clear warning signs.

Q: Is this better than rebuilding my existing unit?
A: In many cases, yes—it eliminates worn internal components and reduces the risk of repeat issues.

Q: Does this unit come pre-filled with gear oil?
A: No, you’ll need to fill it with gear oil before use.

Q: Will I need to adjust the shift linkage after install?
A: It’s a good idea to check and fine-tune it to ensure clean gear engagement.

Q: What does it mean that this part is superseded?
A: It means Yamaha has replaced it with a newer version, but this one may still fit depending on your setup.

• Supersessions
  6E5-45300-14-4D, 6E5-45300-14-8D, 6E5-45300-14-EK, 6E5-45300-15-8D, 6E5-45300-16-8D, 6E5-45300-18-8D, 6E5-45300-1A-8D, 6E5-45300-1A-8D