Yamaha - Trim Tab Anode - Corrosion Protection - F9.9G F15 - 66M-45371-00-00

Overview

On smaller four-stroke Yamahas, this is one of those parts that quietly does its job until it’s gone. The trim tab anode takes the corrosion hit so your lower unit doesn’t, especially if you’re running in salt or mixed water. It also doubles as a trim tab, helping fine-tune steering balance while protecting the gearcase. Keep an eye on it—once it’s worn down, it’s time to swap it out.

Key Features

• Corrosion Protection – Sacrificial metal design helps protect lower unit components from electrolysis.

• Steering Torque Adjustment – Functions as a trim tab to help reduce steering pull.

• OEM Yamaha Fitment – Designed specifically for smaller Yamaha four-stroke outboards.

• Durable Marine Construction – Built to withstand continuous exposure to water and harsh conditions.

Engine & Boat Compatibility

• F9.9G
• F15

FAQ

Q: How do I know when the anode needs replacing?
A: When it’s significantly worn down or pitted, it’s no longer protecting the engine effectively.

Q: Does this part affect steering?
A: Yes, it can be adjusted slightly to help balance steering torque.

Q: Is this necessary for freshwater use?
A: Yes, corrosion can still occur, just at a slower rate than in saltwater.

Q: How often should I check it?
A: It’s a good idea to inspect it every few trips or during regular maintenance.

• Engine Application
  • F9.9G
  • F15