66T-85520-00 Charge Coil Assembly for Yamaha 40X E40X | JLM Marine

Charge Coil Assembly – Fits Yamaha 2-Stroke 40HP 40X E40X (1998-2017)

This Charge Coil Assembly is engineered as a direct replacement for Yamaha 2-stroke 40HP outboard engines, specifically the 40X and E40X series from 1998 through 2017. Designed for plug-and-play installation, it restores reliable charging system performance to keep your engine running at peak efficiency.

This assembly directly replaces OEM part number 66T-85520-00-00, ensuring seamless compatibility with your original equipment. Built with highest-grade lamination materials and copper windings rated to 200°C, it delivers durability and consistent output in demanding marine environments.

• Includes connector for hassle-free installation
• All units are factory-tested before shipment
• Plug-and-play design for quick, direct fitment

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.

Compatibility chart is for reference only. Please compare with your faulty unit and the images provided to confirm fitment.

Technical Specifications

Package Contents

Your purchase includes:

• 1 × Charge Coil Assembly

The package contains all the parts shown in the product images.

Installation Guide

1. Disconnect the battery and ensure the engine is completely off before beginning work.
2. Locate the existing charge coil assembly on your Yamaha outboard, typically found under the flywheel cover.
3. Remove the flywheel cover by unscrewing the retaining bolts; set aside all hardware carefully.
4. Disconnect the electrical connector from the old charge coil assembly.
5. Remove the mounting bolts securing the old coil to the stator plate.
6. Carefully lift out the old charge coil assembly and inspect the mounting area for corrosion or debris.
7. Position the new charge coil assembly onto the stator plate, aligning the mounting holes precisely.
8. Install and hand-tighten the mounting bolts, then torque to manufacturer specifications.
9. Reconnect the electrical connector to the new assembly, ensuring a secure, snug fit.
10. Reinstall the flywheel cover and tighten all retaining bolts evenly.
11. Reconnect the battery and test the charging system output with a multimeter.
12. Run the engine at various RPMs to confirm proper charging voltage and system operation.

Troubleshooting & FAQ

Q: How do I confirm this charge coil fits my Yamaha engine?
A: Cross-reference your engine's model and year with our compatibility table above. Additionally, compare the images and connector style with your original part to ensure a perfect match before ordering.

Q: What are the signs that my charge coil needs replacement?
A: Common symptoms include weak or dead battery after running, dim lights at idle, erratic voltage output, or complete loss of charging. A multimeter test showing inconsistent AC voltage from the coil confirms failure.

Q: How often should I replace the charge coil assembly?
A: Charge coils typically last many years under normal conditions. Replace only when you experience charging system failure or if diagnostic tests reveal faulty output—there is no fixed service interval for this component.

Q: Can I install this myself, or do I need a professional?
A: If you have basic mechanical skills and tools, installation is straightforward—it's a plug-and-play design. However, working under the flywheel requires care; if you're unsure, professional installation is recommended for safety and warranty protection.

Q: OEM vs. Aftermarket—what's the difference?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.