Yamaha - Gear 2 - Drivetrain Component - 6K5-45571-00-00

Overview

The Yamaha Gear 2 | 6K5-45571-00-00 is one of those internal parts that keeps everything turning the way it should inside the lower unit. When gears start to wear, you’ll usually hear it before anything else—grinding, whining, or that rough feel when under load. This gear plays a direct role in how power is transferred, so it needs to stay sharp and properly meshed. If you’re already inside the gearcase, it’s worth making sure this piece is solid.

Key Features

• Efficient Power Transfer – Moves engine output smoothly through the lower unit drivetrain.

• Precision Gear Cut – Designed for proper meshing and reduced internal wear.

• High-Load Strength – Handles torque and stress from continuous operation.

• Stable Operation – Helps maintain consistent performance and reduce vibration.

Compatibility

Compatible with select Yamaha outboard engines using this Gear 2 configuration.
Typically found in Yamaha lower units requiring internal gear replacement.
Always confirm compatibility using your engine model and part number.

FAQs

Q: What are signs this gear is worn out?
A: Grinding noise, slipping under load, or metal shavings in the gear oil.

Q: Can I replace just Gear 2 without replacing others?
A: You can, but matching wear between gears is important for long-term reliability.

Q: What causes gears like this to fail?
A: Lack of lubrication, water intrusion, or impact damage are the most common causes.

Q: Will bad gears affect top speed or just noise?
A: Both—you’ll get noise first, but performance usually drops too.

Q: Is this a difficult repair?
A: Yes, it typically requires full lower unit disassembly and proper setup.