Yamaha - Gear 2 (21T) - Lower Unit Gear - 6CE-45571-00-00

Overview

Inside a Yamaha lower unit, every gear has to work together perfectly, and this one plays a key role in keeping things running smooth under load. When a gear starts to wear, you’ll feel it in noise, rough engagement, or even slipping. I’ve replaced worn gears like this and seen the whole system quiet down and run cleaner. When it’s right, shifting and power delivery feel solid and dependable.

Key Features

• 21-Tooth Gear Design – Precisely cut teeth ensure smooth engagement and consistent rotation.
• High-Strength Construction – Built to handle torque and repeated use without early wear.
• Smooth Gear Interaction – Helps reduce vibration and noise during operation.
• Precision Fit Engineering – Matches Yamaha specifications for proper alignment and function.
• Wear-Resistant Surface – Designed to withstand internal friction and marine conditions.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units requiring a 21-tooth Gear 2 configuration. Suitable for a range of mid to high horsepower applications across recreational and working boats.

FAQ

Q: What are signs this gear is worn out?
A: Grinding sounds, slipping under load, or metal particles in the gear oil are common indicators.

Q: Can I replace just this gear instead of the full set?
A: You can, but it’s important to inspect the other gears to ensure even wear and proper function.

Q: Does a worn gear affect shifting?
A: Yes, it can cause rough engagement, hesitation, or inconsistent shifting.

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

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