Aluminum Anode Kit – Fits Yamaha 300-350 HP XP Outboards (Replaces 8M6008000)
Aluminum Anode Kit – Fits Yamaha 300-350 HP XP Outboards (Replaces 8M6008000) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Aluminum Anode Kit – Fits Yamaha 300-350 HP XP Outboards (Replaces ...
Product Details
This Aluminum Anode Kit – Fits Yamaha 300-350 HP XP Outboards provides complete corrosion protection for your engine in saltwater and brackish water. Milled from military-grade aluminum (MIL-DTL 24779), this kit offers superior performance and longevity compared to zinc anodes in these environments.
It serves as a direct interchange for Quicksilver 8M6008000, Tecnoseal 21107AL, Martyr CMY300350KITA, and Performance Metals 10492A.
- Engineered for optimal performance in salt and brackish water.
- Installs as a direct replacement for factory OEM anodes with no modification needed.
- Kit includes all necessary anodes for a complete lower unit service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Quicksilver | 8M6008000 | Kit Number |
| Tecnoseal | 21107AL | Kit Number |
| Martyr | CMY300350KITA | Kit Number |
| Performance Metals | 10492A | Kit Number |
| Yamaha (OEM) | 6AW-45251-00 | Component Part |
| Yamaha (OEM) | 6AW-45373-00 | Component Part |
| Yamaha (OEM) | 6AW-45619-00 | Component Part |
Engine & Model Compatibility
Confirm your engine model in the table below. Verifying OEM part numbers is the best way to ensure fitment.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | 300-350 HP Outboards | 300-350 | 4-Stroke | 6AW-45251-00, 6AW-45373-00, 6AW-45619-00 | Fits XP Models |
Technical Specs
- Product Type
- Aluminum Anode Kit
- Material
- Military-Grade Aluminum (MIL-DTL 24779)
- Recommended Use
- Salt and brackish water
- Also Suitable For
- All water types (salt, brackish, or fresh)
- Installation
- Direct replacement for factory anodes
- Package Dimensions
- 27 cm × 20 cm × 8 cm (10.6" × 7.9" × 3.1")
- Weight
- 0.9 kg (1.9 lbs)
What’s in the Box
- 1 x Lower Gearcase Anode (Replaces OEM 6AW-45251-00)
- 1 x Trim Tab Anode (Replaces OEM 6AW-45373-00)
- 1 x Shaft Housing Anode (Replaces OEM 6AW-45619-00)
Installation Notes
- Disconnect the boat's battery before starting work.
- Unbolt and remove the old, depleted anodes. Thoroughly clean any corrosion or residue from the mounting surfaces.
- Securely fasten the new anodes. Ensure there is direct, clean metal-to-metal contact for proper electrical conductivity.
- Do not paint the anodes or their fastening hardware, as this will insulate them and prevent them from working correctly.
- Check anodes for 50% decay every 6-12 months as part of regular maintenance.
Troubleshooting & FAQ
What is the difference between aluminum and zinc anodes?
Aluminum anodes have a higher negative voltage than zinc, providing better protection in brackish and saltwater. They are the preferred choice for modern outboard engines operating in these environments.
How do I know when to replace my anodes?
Anodes should be replaced when they are 50% corroded. Regular inspection (at least twice a year) is recommended. Visible pitting, crumbling, or significant size reduction are clear signs that a replacement is needed.
Will this kit fit my specific engine year?
This kit is designed for Yamaha 300-350 HP 4-stroke XP outboards. Since specific year ranges are not provided, the most reliable way to confirm fitment is to match the OEM part numbers (e.g., 6AW-45251-00) to your engine's requirements, found in your service manual.
Does this kit include installation hardware (bolts/screws)?
This kit contains only the anodes. Original hardware can often be reused if it's in good condition. However, some sources indicate hardware may not be included, so it is best to be prepared to source it separately if needed.
Is this an OEM part or an aftermarket replacement?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials, and manufactured in an ISO 9002 facility and batch-inspected for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options appear at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in original condition. Please see our full policy page or reach out for instructions.
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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