Yamaha - Gear 1 (1.841/1 Ratio) - Internal Drivetrain Component - 6T5-45881-20-00

Overview

The Yamaha Gear 1 (1.841 Ratio) | 6T5-45881-20-00 is one of those internal parts you don’t see, but you’ll definitely notice when it starts going bad. When a gear wears down or gets damaged, it shows up fast—noise, rough operation, or inconsistent power transfer. This gear plays a key role in how power moves through the system, so it needs to stay precise and properly meshed. If you’re already inside the lower unit or engine, this is one of those parts worth replacing while you’re in there.

Key Features

• Reliable Power Transfer – Moves rotational force between components for smooth and consistent operation.

• OEM Fit Precision – Built to Yamaha specifications for proper gear meshing and alignment.

• Optimized Gear Ratio – 1.841 ratio supports a balanced mix of power and efficiency.

• Durable Load Handling – Designed to withstand continuous torque and marine operating conditions.

Boat Compatibility

Verify compatibility with your specific Yamaha engine model and part number before installation.

FAQs

Q1: What are signs this gear is worn or damaged?
A: Grinding noise, rough operation, or reduced performance are common indicators.

Q2: Can a worn gear affect other components?
A: Yes, damaged gears can put extra stress on surrounding parts and lead to further damage.

Q3: Is this a common wear item?
A: Not typically, but over time and heavy use, gears can wear down.

Q4: Does replacing this require major disassembly?
A: In most cases, yes, since it’s located inside the engine or lower unit.

Q5: Should I inspect other parts during replacement?
A: It’s a good idea to check bearings, seals, and other gears while everything is apart.