Yamaha - Gear 2 - Lower Unit Drivetrain - 6E5-45571-01-00

Overview

When you’re dealing with lower unit performance, gears are right at the center of it all. This gear takes constant load every time you’re on the throttle, and once it starts to wear, you’ll feel it through noise or rough operation. I’ve seen setups where one worn gear ends up affecting the whole drivetrain. Replacing it helps bring everything back to smooth, reliable power transfer.

Key Features

• Precision Gear Engagement – Ensures smooth meshing with mating gears for consistent operation.
• Hardened Metal Construction – Built to withstand torque, load, and long-term drivetrain stress.
• Reduced Vibration Operation – Helps maintain balanced rotation for smoother performance.
• OEM Fitment Accuracy – Matches original specifications for proper alignment and dependable installation.

Engine & Boat Compatibility

Designed for Yamaha 2-stroke outboard engines with standard lower unit gearcases. Commonly used on mid-range horsepower motors found on fishing boats, bay boats, and utility vessels.

FAQ

Q: What are signs of a worn gear in the lower unit?
A: Grinding noise, vibration, or metal particles in the gear oil are common indicators.

Q: Can I replace just one gear or should I inspect others?
A: You should inspect all related gears since wear often happens across multiple components.

Q: What causes gear damage in outboards?
A: Low or contaminated gear oil, water intrusion, or impact with underwater objects.

Q: Is this repair something I can do myself?
A: It’s more advanced and usually requires proper tools and setup for correct alignment.

Q: How often should I check gear oil condition?
A: Regular checks every season or after heavy use help catch problems early.