Yamaha - Gear 2 - Lower Unit Component - 689-45571-00-00

Overview

The Gear 2 is a critical internal component of your Yamaha outboard’s lower unit, responsible for transmitting power through the gearcase to support propulsion and gear engagement. It works in conjunction with other gears—such as the pinion and forward gear—to enable smooth shifting and efficient transfer of engine power to the propeller. Precision-machined for durability and proper alignment, this gear ensures consistent performance under demanding marine conditions. If worn or damaged, it can lead to grinding, slipping, or reduced efficiency. Replacing it helps restore reliable operation and smooth drivetrain performance.

Key Features

• Power Transmission Component – Transfers rotational force within the lower unit.
• Supports Gear Engagement – Works with other gears for smooth forward and reverse operation.
• Precision-Machined Design – Ensures proper alignment and efficient performance.
• OEM Yamaha Construction – Built to factory specifications for durability and exact fit.

Engine & Boat Compatibility

Compatible with Yamaha outboards using this component within the lower unit / gearcase assembly (commonly found in mid-range outboards).

FAQ

Q: What does Gear 2 do?
A: It works with other gears to transfer engine power and enable smooth gear engagement.

Q: Is this a forward or reverse gear?
A: It is typically part of the gear set and may function as a reverse or driven gear depending on the setup.

Q: What are signs it needs replacement?
A: Grinding noise, slipping gears, vibration, or reduced propulsion efficiency.

Q: Is this inside the lower unit?
A: Yes, it is an internal component within the gearcase.

Q: Is installation difficult?
A: Yes, it requires lower unit disassembly and is typically handled by experienced technicians.