Yamaha - Gear - Lower Unit Gear - 6D1-45571-00-00

Overview

When you're inside a Yamaha lower unit, you realize pretty quickly that every gear has to pull its weight. This gear is part of that system that keeps everything turning smoothly when you’re shifting and running under load. I’ve worked on setups where a worn gear threw off the whole feel of the motor, from noise to performance. Replace it with a solid one like this, and you get back that smooth, dependable operation you expect out on the water.

Key Features

• Precision Gear Cut – Designed for smooth engagement and consistent rotation within the lower unit.
• High-Strength Construction – Built to handle torque and stress from regular marine use.
• Reliable Power Transfer – Supports efficient movement of power through the drivetrain.
• Factory-Spec Fitment – Matches Yamaha tolerances for proper alignment and performance.
• Wear-Resistant Surface – Helps protect against internal wear and corrosion in marine environments.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units requiring this gear configuration. Suitable for a range of mid to high horsepower applications in both recreational and light commercial marine use.

FAQ

Q: What are signs this gear needs to be replaced?
A: Grinding sounds, slipping under load, or metal debris in the gear oil are common warning signs.

Q: Can I replace just this gear without touching others?
A: You can, but it’s best to inspect the full gear set to ensure proper wear and alignment.

Q: Does gear wear affect performance on the water?
A: Yes, worn gears can reduce efficiency, cause vibration, and impact how smoothly the motor runs.

Q: Is this a difficult installation?
A: It requires proper tools and experience to set clearances and alignment correctly.

Q: How can I extend the life of this gear?
A: Regular gear oil changes and checking for water intrusion will help prevent premature wear.