Zinc Anode Kit – Fits Yamaha 200-250 HP Outboards (Replaces 21104)
Zinc Anode Kit – Fits Yamaha 200-250 HP Outboards (Replaces 21104) is backordered and will ship as soon as it is back in stock.
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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
Zinc Anode Kit – Fits Yamaha 200-250 HP Outboards (Replaces 21104)
Product Details
This military-grade Zinc Anode Kit – Fits Yamaha 200-250 HP Outboards (Replaces 21104) provides essential protection against galvanic corrosion in saltwater environments. It is engineered for a wide range of Yamaha 200-250 HP engines, including 2-Stroke and 4-Stroke models from 1990 to 2006 and newer. The kit is compatible with both standard and left-hand rotation configurations.
It serves as a direct interchange for Tecnoseal 21104, Martyr CMY200250KIT, Seachoice 95231, Quicksilver 8M6007985, and US Marine Products/Zincs For Boats YAMAHA200-250KIT.
- Engineered for use in saltwater.
- Provides direct bolt-on installation with no modification required.
- Includes all necessary zinc anodes for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tecnoseal | 21104 |
| Martyr | CMY200250KIT |
| Seachoice | 95231 |
| Quicksilver | 8M6007985 |
| US Marine Products/Zincs For Boats | YAMAHA200-250KIT |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for a variety of Yamaha outboards. Please verify your specific model and year, as some serial number breaks may exist.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F200TXR | 200 | 4-Stroke | 2002–2006+ | 21104 | Multiple serial breaks listed in compatibility |
| Yamaha | F225TUR/TXR | 225 | 4-Stroke | 2002–2006+ | 21104 | Multiple serial breaks listed in compatibility |
| Yamaha | F250TUR/TXR | 250 | 4-Stroke | 2005–2006+ | 21104 | Left and right hand models |
| Yamaha | LF200TXR | 200 | 4-Stroke | 2002–2006+ | 21104 | Left hand rotation model |
| Yamaha | LF225TUR/TXR | 225 | 4-Stroke | 2002–2006+ | 21104 | Left hand rotation model |
| Yamaha | LF250TUR/TXR | 250 | 4-Stroke | 2005–2006+ | 21104 | Left hand rotation model |
| Yamaha | 225/250 Series | 225-250 | 2-Stroke | 1990–2001 | 21104 | Includes T, TX, TL, S, SX, L, LX model variants |
| Yamaha | V200/V225 Series | 200-225 | 2-Stroke | 1998–2000 | 21104 | V-series models |
Technical Specs
- Product Type
- Anode Kit (Sacrificial Zinc)
- Intended Use
- Saltwater environments
- Housing Material
- Military Grade Zinc
- Installation
- Direct bolt-on
- Connection
- Bolt mounting
- Color
- Metallic (zinc)
- Dimensions
- Height: 7.0; Width: 24.0; Length: 34.0;
- Operating Temperature
- Marine environment temperatures
What’s in the Box
- 1 x Skeg Anode (Replaces OEM 61A-45371-00)
- 1 x Trim Tab Anode (Replaces OEM 6G5-45251-01)
Installation Notes
- Disconnect the engine's battery cables before beginning work.
- Locate and unbolt the old, corroded anodes from the skeg and trim tab assembly.
- Thoroughly clean the mounting surfaces on the outboard. A wire brush is effective for removing any buildup or oxidation.
- Ensure a clean, direct metal-to-metal contact between the new anode and the engine unit.
- Securely fasten the new anodes. Do not over-tighten the bolts.
- Once installation is complete, reconnect the battery cables.
Troubleshooting & FAQ
How often should zinc anodes be replaced?
Anodes should be inspected during regular maintenance and replaced when they are 50-60% corroded. For most boaters, this is typically once per season, but it can vary based on water salinity, electrical currents, and usage.
What are the signs that my anodes need replacing?
Visible pitting, crumbling, or significant reduction in size are clear indicators for replacement. If an anode looks mostly gone, it has stopped being effective and should be replaced immediately to protect underwater metals.
Will this kit fit both standard and counter-rotation lower units?
Yes, this kit is compatible with both standard (right-hand) and counter-rotation (left-hand) Yamaha outboard models as specified in the compatibility table.
Why should I use zinc anodes instead of aluminum or magnesium?
Zinc anodes are specifically formulated for optimal protection in saltwater. Using aluminum or magnesium in saltwater can lead to under-protection or over-protection, respectively, which can damage your engine components.
Do I need to paint my new anodes?
No, never paint anodes. Paint insulates the anode, preventing it from functioning correctly. Anodes must have direct contact with the water to provide galvanic protection.
Is this kit compatible with both 2-stroke and 4-stroke engines?
Yes, this kit fits a wide range of Yamaha 2-stroke and 4-stroke outboards within the 200-250 HP range, from 1990 to 2006 and newer. Please check the compatibility list to confirm your specific model.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our 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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