Yamaha - Gear 2 - Lower Unit Gear Train Component - 6E7-45571-00-00

Overview

When you’ve got the lower unit apart, you quickly realize how much these gears matter. I’ve seen one worn gear throw off the whole system—noise, vibration, even slipping under load. Gear 2 plays a key role in transferring power smoothly through the case. When it’s in good condition, everything meshes clean and the motor runs quiet and strong.

Key Features

• Precision Gear Tooth Design – Ensures smooth engagement with mating gears for reliable operation.
• Consistent Torque Transfer – Helps deliver steady power from the engine to the propeller.
• Hardened Metal Construction – Built to handle load, friction, and continuous marine use.
• Reduced Vibration Operation – Supports smoother gear meshing and quieter performance.
• Exact Yamaha Fitment – Matches factory specifications for proper alignment and installation.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units utilizing internal gear train systems. Commonly used across a range of Yamaha outboards in recreational and commercial marine applications. Suitable for freshwater and saltwater environments where dependable propulsion and durability are essential.

FAQ

Q: What are signs this gear is worn or failing?
A: Grinding noise, vibration, or metal debris in the gear oil are common signs.

Q: Should I replace other gears at the same time?
A: It’s recommended to inspect all gears since wear often affects multiple components.

Q: Any tips for installing this gear?
A: Proper alignment and lubrication during assembly are critical to avoid premature wear.

Q: How does water intrusion affect gears?
A: Water can cause corrosion and reduce lubrication, leading to faster wear.

Q: Can a damaged gear affect performance?
A: Yes, it can lead to poor power transfer, noise, and potential lower unit damage.