Yamaha - Internal Crankcase Anode Kit - F90, F115 Corrosion Protection - 2004–2005

Overview

On the 2004 to 2005 F90 and F115 models, these internal anodes are doing critical work behind the scenes every time the engine is in the water. They’re built to take on corrosion before it reaches the engine’s internal metal components, especially in saltwater conditions. As they wear down, that protection fades, leaving the engine more exposed. Replacing them along with the grommets is simple maintenance that helps keep your motor protected and running reliably.

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 fit and sealing.

• Designed for 2004–2005 Models – Built for Yamaha F90 and F115 outboards in these model years.

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

Engine & Boat Compatibility

• F90 2004–2005
• F115 2004–2005

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 2004–2005
  • F115 2004–2005