Yamaha - Internal Crankcase Anode Kit - F90, F115 Corrosion Protection 

Overview

On the 2009 to 2011 F90 and F115 models, these internal anodes are doing the kind of work you don’t see—but definitely rely on. They’re designed to take on corrosion before it reaches critical internal engine parts, especially if you’re running in saltwater. Once they wear down, that protection starts to fade and the engine becomes vulnerable. Replacing them along with the grommets is simple maintenance that helps keep everything protected and running the way it should.

Key Features

• Internal Corrosion Protection – Sacrificial anodes help prevent electrolysis from damaging internal engine components.

• Complete Kit with Grommets – Includes both anodes and matching grommets for proper installation and sealing.

• Designed for F90 and F115 Models – Built for Yamaha outboards from 2009 through 2011.

• Preventative Maintenance Essential – Helps extend engine life by protecting internal metal surfaces over time.

Engine & Boat Compatibility

• F90 2009–2011
• F115 2009–2011

FAQ

Q: How often should I replace these internal anodes?
A: Typically once per season, or more often if the engine is used in saltwater regularly.

Q: What happens if I don’t replace them?
A: Corrosion can begin attacking internal engine components once the anodes are worn out.

Q: Are the grommets important to replace too?
A: Yes, they ensure proper sealing and secure installation of the anodes.

Q: How do I know if the anodes are worn?
A: If they’re heavily corroded or significantly reduced in size, it’s time to replace them.

Q: Is this a difficult job?
A: It’s usually straightforward with basic tools, depending on engine access.

• Engine Application
  • F90 2009–2011
  • F115 2009–2011