Aluminum Trim Tab Anode – Fits Yamaha 60HP 70HP 90HP 2-Stroke (Replaces 688-45371-02)

Product Details

This Aluminum Trim Tab Anode – Fits Yamaha 60HP 70HP 90HP 2-Stroke (Replaces 688-45371-02) is engineered as a direct-fit replacement for Yamaha outboards from 60 to 90 horsepower, covering a broad range of 2-stroke models and select 4-stroke variants produced between 1984 and 2004. It protects the lower unit and trim tab from galvanic corrosion in saltwater and brackish environments.

This anode directly replaces Yamaha part numbers 688-45371-02-00, 67F-45371-00-00, 688-45371-01-00, 6K5-45251-00-00, 6K5-45371-00-00, and Technoseal TEN01104.

• Aluminum alloy construction for efficient sacrificial protection
• Installs directly to the trim tab using the included mounting bolt
• Compatible with both 2-stroke and 4-stroke Yamaha outboards in the specified range

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Material

Aluminum alloy

Application

Trim tab sacrificial anode

Mounting Hardware

Bolt included

Environment

Saltwater and brackish water

What's in the Box

• 1 × Anode with Bolt

Installation Notes

1. Ensure the engine is off and the boat is securely positioned on a stable surface or trailer.
2. Locate the existing trim tab anode on the lower unit; it is typically mounted on the underside of the trim tab.
3. Remove the old anode by unscrewing the mounting bolt with the appropriate wrench or socket.
4. Clean the mounting surface thoroughly to remove any corrosion, marine growth, or residue. A clean contact surface ensures proper electrical conductivity.
5. Position the new aluminum anode onto the trim tab, aligning the mounting hole.
6. Insert the included bolt and tighten securely, ensuring the anode is flush against the surface without over-torquing.
7. Inspect the anode periodically (every 50–100 hours of operation or monthly in saltwater) and replace when worn to approximately 50% of original thickness.

Troubleshooting & FAQ

How often should I replace the trim tab anode?

Inspect every 50–100 hours of operation or at least monthly in saltwater environments. Replace when the anode has eroded to approximately 50% of its original thickness. Waiting until complete erosion risks corrosion damage to the lower unit and trim tab.

Can I use this anode in freshwater?

While aluminum anodes function in freshwater, they are optimized for saltwater and brackish environments. In freshwater, galvanic corrosion is minimal, and zinc or magnesium anodes may be more appropriate depending on the application.

Why is the anode corroding faster than expected?

Accelerated anode erosion can result from stray electrical currents, improper grounding, or severe galvanic activity in marinas with mixed metal hulls. Check for electrical faults and ensure all bonding connections are secure. Faster erosion indicates the anode is doing its job protecting more expensive components.

Will this fit my Yamaha 60HP 6H2 or 6H3 2-stroke?

Yes, this anode is confirmed compatible with Yamaha 6H2 and 6H3 series 60HP and 70HP 2-stroke models. Always verify the original part number on your existing anode matches one of the listed equivalents.

What happens if I don't replace a worn anode?

A depleted anode stops providing sacrificial protection, allowing galvanic corrosion to attack the trim tab, lower unit housing, and other aluminum or steel components. This can lead to costly repairs and reduced engine lifespan.

Can I paint or coat the anode?

No. Coating or painting the anode prevents electrical contact and renders it ineffective. The anode must maintain bare metal contact with the protected surface to function properly.

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 against 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.