Trim Tab Zinc Anode – Fits Yamaha Outboard 50-100HP (Replaces 688-45371-02)

Trim Tab Zinc Anode – Fits Yamaha Outboard 50-100HP (Replaces 688-45371-02)

This trim tab zinc anode is designed for a wide range of Yamaha Outboard 2-Stroke and 4-Stroke engines, primarily covering 50HP to 100HP models. It also fits select 115HP to 200HP models. As a sacrificial anode, it protects the engine’s lower unit and propeller from galvanic corrosion in freshwater and saltwater environments.

It serves as a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring broad compatibility. Please verify your engine model and original part number before ordering to ensure correct fitment.

• Installation Method: Simple bolt-on design with M10 threads.
• Material Quality: Manufactured from a high-grade zinc alloy that meets Mil-Spec A-18001K standards for maximum protection.
• Function: Acts as a crucial part of the trim and tilt system while also providing essential corrosion protection.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Trim Tab Zinc Anode (Replaces 688-45371-02)
• Note: Mounting hardware (bolt) is not included.

Installation Guide

1. Tilt the outboard motor up to access the lower unit and locate the existing trim tab anode, typically situated on the underside of the anti-cavitation plate.
2. Use a metric wrench to remove the bolt securing the old anode. The bolt installs from the top.
3. Once the bolt is removed, the old anode should drop out. Note its orientation.
4. Thoroughly clean the mounting surface on the lower unit to ensure good metal-to-metal electrical contact, which is essential for proper function.
5. Position the new anode and insert the mounting bolt.
6. Tighten the bolt securely. Do not overtighten. The anode should be firmly in place without any movement.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Start by checking the compatible engine models table on this page. Then, cross-reference your existing part number with the numbers listed in our "Part Number Cross-Reference" table. For Yamaha owners, using the linked serial number guide can help confirm your exact model and year.

How often should I replace my trim tab anode?
Anodes should be inspected during routine maintenance, at least once a year. We recommend replacement when the anode is approximately 50-75% eroded. Frequent use in saltwater may require more frequent replacement.

What tools are needed for installation?
Installation typically only requires a basic metric wrench or socket to fit the M10 mounting bolt. No specialized tools are necessary.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.