Yamaha - Lower Unit Assembly - Gearcase Component - F90 - F115 - 6EK-45300-11-8D

Overview

The Yamaha Lower Unit Assembly | 6EK-45300-11-8D is what keeps your engine’s power turning into real push on the water. When a lower unit starts going bad, you’ll feel it right away—noise, vibration, or loss of performance. This assembly handles the gears, driveshaft, and prop output, so everything depends on it being solid and aligned. If you’re replacing a worn or damaged unit, this is the kind of part that brings your motor back to running like it should.

Key Features

• Efficient Power Transfer – Delivers engine power smoothly to the propeller for reliable performance.

• OEM Fit Precision – Built to Yamaha specifications for proper alignment and straightforward installation.

• Complete Gearcase Assembly – Pre-assembled unit for easier replacement and dependable operation.

• Corrosion-Resistant Construction – Designed to withstand harsh saltwater and freshwater environments.

Engine & Boat Compatibility

• F90 2017-Current
• F115 2014-Current

FAQs

Q1: What are signs the lower unit is failing?
A: Grinding noise, vibration, water in gear oil, or reduced performance.

Q2: Can I rebuild instead of replacing it?
A: Minor issues can be repaired, but major gear damage usually calls for replacement.

Q3: Does this come ready to install?
A: Yes, it’s a complete assembly designed for direct replacement.

Q4: Should I check anything before installing?
A: It’s a good idea to inspect seals, mounting points, and the driveshaft.

Q5: Is installation difficult?
A: It’s manageable with experience, but proper alignment is important.

• Supersessions
  6EK-45300-10-8D, 6EK-45300-12-8D, 6EK-45300-13-8D, 6EK-45300-13-8D
• Engine Application
  • F90 - 2017 to 2020
  • F115 - 2014 to 2020