Sierra Anode 18-6090, Replaces 6G5-45251-01-00, Aluminum Transom Bracket Anode for Yamaha 115-225HP Outboards (1988-02)

The Sierra 18-6090 is an aluminum sacrificial anode designed for use on the transom bracket of Yamaha outboard engines from 115HP to 225HP (1988-02). Sacrificial anodes protect the more critical, and more expensive, metal components of your outboard from galvanic corrosion by corroding themselves first. As an aluminum anode, the 18-6090 is intended for brackish water use, or for boats that operate in both fresh and salt water environments, giving it broader application than a single-environment zinc or magnesium anode. It directly replaces OEM part number 6G5-45251-01-00, so it installs as a direct fit in place of the original transom bracket anode without modification. Regular anode inspection and replacement is one of the simplest ways to protect an outboard's lower unit and bracket hardware from corrosion damage, and choosing the correct anode material for your water conditions is essential to getting the protection you expect. The 18-6090 weighs 0.93 pounds and is sold as a single anode. Confirm your outboard's horsepower and the mounting location on the transom bracket before ordering to be sure this is the correct anode for your application.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6090
• Product Type: Anode
• Material: Aluminum
• Recommended Water Environment: Brackish, or mixed fresh and salt water use
• Mounting Location: Transom bracket
• Fitment: Yamaha outboards, 115-225HP (1988-02)
• Weight: 0.93 pounds
• UPC: 030999976987

Fitment

• Yamaha outboards, 115-225HP (1988-02)

Replaces (OEM)

• 6G5-45251-01-00

Frequently Asked Questions

What does the Sierra 18-6090 anode fit? The Sierra 18-6090 fits Yamaha outboards from 115HP to 225HP (1988-02) and mounts on the transom bracket.

Is the 18-6090 a zinc, magnesium, or aluminum anode? It is an aluminum anode, which Sierra designates for brackish water use or for boats that run in both fresh and salt water.

What OEM part number does the 18-6090 replace? The 18-6090 directly replaces OEM number 6G5-45251-01-00.

Can I use this anode in freshwater only? The 18-6090 is an aluminum anode intended for brackish or mixed fresh/salt water use; for freshwater-only applications, Sierra designates magnesium anodes instead.

Can I use this anode in saltwater only? The 18-6090 is aluminum, meant for brackish or mixed environments; for saltwater-only use, Sierra designates zinc anodes instead.

Where does the 18-6090 anode mount on the outboard? It is designed for use on the transom bracket of the outboard, not the lower unit or engine block.

How much does the Sierra 18-6090 weigh? The 18-6090 transom bracket anode weighs 0.93 pounds.

Will the 18-6090 fit any Yamaha outboard? It is designated for Yamaha outboards in the 115-225HP range built in 1988-02; check your engine's horsepower before ordering.

How do I know when to replace this anode? Sacrificial anodes like the 18-6090 should be replaced once they have corroded down significantly, generally before more than half the material is gone, to keep protecting the transom bracket from galvanic corrosion.

Is the 18-6090 a genuine Sierra part? Yes, 18-6090 is the Sierra manufacturer part number for this aluminum transom bracket anode.