Yamaha - Gear 2 - Lower Unit Drivetrain Component - 6J8-45571-00-00

Overview

When you start hearing noise or feeling rough engagement in the lower unit, gears are usually where the problem begins. This gear plays a direct role in how power is transferred and how smoothly the motor shifts under load. I’ve seen worn gears cause all kinds of issues that disappear once replaced. It’s one of those internal parts that keeps everything running clean and predictable when it’s in good shape.

Key Features

• Smooth Gear Engagement – Designed for clean interaction with mating gears inside the lower unit.
• High-Strength Construction – Built to handle continuous load and torque from engine output.
• Precision Machining – Ensures proper alignment and reduced wear during operation.
• Factory-Spec Fitment – Matches Yamaha drivetrain systems for accurate installation.
• Wear-Resistant Design – Engineered to maintain performance over extended use.

Engine & Boat Compatibility

Designed for Yamaha outboard engines with compatible lower unit drivetrain systems. Commonly used across small to mid-range outboards on fishing boats, skiffs, and utility vessels. Always confirm part number compatibility before installation.

FAQ

Q: What are signs this gear is worn out?
A: Grinding noise, vibration, or rough shifting are common indicators.

Q: Can this affect overall performance?
A: Yes, worn gears reduce efficiency and can lead to poor power transfer.

Q: Is this a simple replacement?
A: It usually requires lower unit disassembly, so it’s often part of a full service.

Q: Should I inspect other gears at the same time?
A: Definitely—checking all related components helps prevent repeat issues.

Q: What causes gear wear over time?
A: Lack of lubrication, water intrusion, and heavy use are the main causes.