6F5-85540-22 CDI Box Power Pack for Yamaha K40J E40J E40G EK40J | JLM Marine

CDI Box Power Pack for Yamaha K40J E40J E40G EK40J | JLM Marine

This CDI Box Power Pack is engineered to fit Yamaha 2-stroke 40HP outboard engines, including K40J (1993-2002), E40J (2003), E40G (2003), and EK40J (2003) models. Designed to deliver reliable ignition performance, this aftermarket replacement ensures your engine fires consistently and runs smoothly.

This unit directly replaces OEM part numbers 6F5-85540-22, 6F5-85540-21, and 6F6-85540-00, providing a cost-effective solution without sacrificing quality or reliability.

• CDI igniter provides sufficient energy to ignite fuel and stabilize flame instantly
• Plug-and-play installation with all necessary connectors included
• Low heat and low power consumption for efficient operation

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 CDI Igniter
• The package contains all the parts shown in the product images

Installation Guide

1. Disconnect the battery and ensure the ignition is off before beginning work.
2. Locate the existing CDI box on your Yamaha outboard engine.
3. Carefully disconnect all electrical connectors from the old CDI unit, noting their positions.
4. Remove any mounting screws or brackets securing the old CDI box in place.
5. Install the new CDI box in the same location using the original mounting hardware.
6. Connect all electrical plugs to the corresponding connectors on the new CDI unit.
7. Double-check that all connections are secure and properly seated.
8. Reconnect the battery and test the ignition system to ensure proper operation.

Troubleshooting & FAQ

Q: How do I confirm this CDI box fits my Yamaha engine?
A: Cross-reference your engine model and year with the compatibility table above. Also verify your original part number matches 6F5-85540-22, 6F5-85540-21, or 6F6-85540-00.

Q: What are the signs that my CDI box is failing?
A: Common symptoms include difficulty starting, misfiring, irregular idling, loss of power at high RPM, or the engine cutting out unexpectedly. If you experience these issues, inspect the CDI unit and related ignition components.

Q: Can I install this myself or do I need a professional?
A: If you have basic mechanical skills and are comfortable working with electrical connections, installation is straightforward with plug-and-play connectors. However, professional installation is recommended to ensure safety and optimal performance.

Q: How often should I replace the CDI box?
A: CDI boxes typically do not require routine replacement unless they fail. Replace the unit if you experience ignition-related problems or if diagnostic testing indicates a faulty CDI.

Q: What's the difference between this aftermarket CDI and the OEM version?
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.