Yamaha 60-90HP Anode Kit – Fits Yamaha Outboard Motors (Replaces 688-45371-02, 6H1-45251-02)
Yamaha 60-90HP Anode Kit – Fits Yamaha Outboard Motors (Replaces 688-45371-02, 6H1-45251-02) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Yamaha 60-90HP Anode Kit – Fits Yamaha Outboard Motors (Replaces 68...
Product Details
This Yamaha 60-90HP Anode Kit is engineered to protect the lower unit of Yamaha 2-Stroke outboard motors ranging from 60 to 90 HP (model years 1984–2009). These sacrificial anodes corrode in place of your engine's vital metallic components, providing essential protection against galvanic corrosion in marine environments.
This kit serves as a direct replacement for Yamaha OEM parts 688-45371-02 and 6H1-45251-02, as well as aftermarket equivalents from Martyr (CMY6090KIT), Quicksilver (8M6007997), and Tecnoseal (21100).
- Installs easily as a direct bolt-on replacement with included hardware.
- Manufactured with military-grade materials that meet or exceed US Military Specifications.
- Available in Zinc, Aluminum, or Magnesium to match your specific water conditions (salt, brackish, or fresh).
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 688-45371-02 |
| Yamaha | 6H1-45251-02 |
| Martyr | CMY6090KIT |
| Quicksilver | 8M6007997 |
| Tecnoseal | 21100 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 60-70-90 | 60-90 | 2-Stroke | 1984–2009 | 688-45371-02, 6H1-45251-02 | Complete lower unit protection |
Technical Specs
- Product Type
- Sacrificial Anode Kit
- Installation
- Direct bolt-on replacement
- Material Options
- Zinc (saltwater), Aluminum (salt/brackish water), Magnesium (freshwater)
- Housing Color
- Metallic (material dependent)
- Dimensions
- 5.0 x 24.0 x 34.0
- Operating Environment
- Marine (salt, brackish, or fresh water depending on material)
- Other Technical Attributes
- Military-grade materials meeting US Military Specifications
What’s in the Box
- 1 x Trim Tab Anode (688-45371-02)
- 1 x Bracket Anode (6H1-45251-02)
- 1 x Hardware Kit with mounting fasteners
- 1 x Installation Instructions
Installation Notes
- Disconnect the battery or main power supply to the engine to prevent accidental starts.
- Locate and unbolt the old, corroded anodes from the lower unit and trim tab assembly. You may need a wrench or socket set.
- Thoroughly clean the mounting surfaces on the engine. A wire brush is effective for removing old residue and ensuring a clean metal-to-metal connection.
- Position the new anodes onto the clean surfaces and fasten them securely with the provided hardware. Ensure they are tight.
- Do not paint the new anodes, as paint will insulate them and prevent them from functioning correctly.
- Reconnect the battery and check all functions before operating the vessel in water.
Troubleshooting & FAQ
Which anode material do I need: Zinc, Aluminum, or Magnesium?
Choose the material based on the water you operate in most frequently. Use Zinc for saltwater, Magnesium for freshwater, and Aluminum for brackish or mixed-salinity water. Using the wrong type can lead to under-protection or premature corrosion of the anode.
How often should I replace my engine anodes?
Inspect your anodes at least every 6 months. A common rule of thumb is to replace them when they are 50% corroded. The rate of corrosion depends on water salinity, temperature, and electrical currents, so frequent checks are essential.
What are the signs that my anodes have failed or need replacement?
Visible signs include heavy pitting, crumbling, or the anode being mostly or completely gone. If you notice accelerated corrosion, discoloration, or pitting on your propeller, lower unit, or trim tabs, your anodes are likely no longer effective and must be replaced immediately.
Will this kit fit my specific Yamaha 70HP model from 1995?
Yes, this kit is designed to fit the entire range of Yamaha 60, 70, and 90 horsepower 2-stroke outboards manufactured between 1984 and 2009. The compatibility table confirms this fitment. Always cross-reference your OEM part numbers (688-45371-02, 6H1-45251-02) to be certain.
Do I need to paint the anodes after installation?
No, never paint anodes. Paint creates an insulating barrier that prevents the anode from making electrical contact with the water and the metal it's supposed to protect. Anodes must be left as bare metal to function correctly.
Is this an OEM Yamaha part?
This listing is for an aftermarket replacement part, not an original equipment manufacturer (OEM) component. It is built to meet or exceed OEM-level specifications using comparable high-quality, military-grade materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure consistency and performance.
What are the shipping speed and cost?
We ship worldwide, with typical transit times of 5–15 days for most regions. Standard shipping is free for all orders. If available for your location, expedited shipping options and their costs will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. For detailed instructions, please see our policy page or reach out to customer service.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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