Yamaha - Gear 2 Assembly - Drivetrain Component - 6K1-45570-20-00

Overview

The Yamaha Gear 2 Assembly | 6K1-45570-20-00 is one of those internal parts that keeps your lower unit running quiet and smooth when everything’s right. Once gears start wearing out, you’ll hear it first—then feel it under load. This assembly handles a big part of the power transfer inside the gearcase, so it needs to stay tight and properly matched. If you’re already opening up the lower unit, replacing the full assembly saves you from chasing problems later.

Key Features

• Complete Gear Assembly – Includes matched components for consistent internal drivetrain operation.

• Smooth Power Transfer – Helps maintain quiet and efficient movement through the gearcase.

• Precision Fit Components – Designed to align correctly within Yamaha lower unit housings.

• High-Load Durability – Built to handle torque, stress, and continuous use on the water.

Compatibility

Compatible with select Yamaha outboard engines using this Gear 2 assembly configuration.
Typically used 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 assembly is going bad?
A: Grinding noise, slipping under load, or metal in the gear oil are common signs.

Q: Why replace the full assembly instead of just one gear?
A: Matched gears wear together, so replacing the full set helps prevent uneven wear.

Q: Can this affect shifting performance?
A: Yes, worn gears can lead to rough or inconsistent gear engagement.

Q: What usually causes gear damage?
A: Water intrusion, low gear oil, or impact damage are the main causes.

Q: Is this a difficult repair?
A: It typically requires full lower unit teardown and proper setup, so experience is important.

• Supersessions
  6K1-45571-01-00, 6K1-45570-01-00