68T-85540-00 C.D.I. Unit Assembly for Yamaha F6 F8 F9.9 T8 T9.9 | JLM Marine

68T-85540-00 C.D.I. Unit Assembly for Yamaha F6 F8 F9.9 T8 T9.9 Outboard Engines

This C.D.I. Unit Assembly (68T-85540-00) is designed for Yamaha 4-stroke outboard engines ranging from 6HP to 9.9HP. It fits a comprehensive range of models from the F6, F8, F9.9, T8, and T9.9 series, covering production years from 2001 through 2006 and later. This critical ignition component ensures reliable spark timing and optimal engine performance across long-shaft, short-shaft, electric-start, and manual-start configurations.

This aftermarket assembly serves as a direct replacement for OEM part number 68T-85540-00, providing a cost-effective solution for restoring proper ignition function to your Yamaha outboard motor.

• Replacement C.D.I. unit for Yamaha 4-stroke outboards (8HP & 9.9HP configurations)
• Compatible with both electric-start and pull-start models
• Fits F-series (standard) and T-series (high-thrust) engine families

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 × C.D.I. Unit Assembly (68T-85540-00)

Installation Guide

1. Disconnect the battery: Remove the negative terminal first to prevent electrical shock or short circuits.
2. Locate the existing C.D.I. unit: It is typically mounted on the engine block or inside the cowling near the ignition coil. Refer to your engine's service manual for exact placement.
3. Disconnect the wiring harness: Carefully unplug all electrical connectors leading to the old C.D.I. unit, noting their positions for reassembly.
4. Remove mounting fasteners: Unscrew or unbolt the old C.D.I. unit from its bracket or mounting surface.
5. Compare the old and new units: Verify that connector types, mounting holes, and overall dimensions match before proceeding.
6. Install the new C.D.I. unit: Secure it to the mounting bracket using the original fasteners, ensuring a snug fit.
7. Reconnect the wiring harness: Attach each connector to the corresponding terminal on the new unit, ensuring each clicks or locks into place.
8. Reconnect the battery: Attach the negative terminal and ensure all connections are tight.
9. Test the ignition system: Turn the key to the start position and confirm the engine cranks and fires normally. Listen for smooth operation without misfires.
10. Check for error codes: If your engine has a diagnostic system, verify no fault codes are present.
11. Secure the cowling: Replace the engine cover and ensure all fasteners are tight.
12. Perform a water test: Run the engine under normal operating conditions to confirm stable ignition and performance.

Troubleshooting & FAQ

Q: How do I confirm this C.D.I. unit fits my Yamaha engine?
A: Cross-reference your engine's model and year with the compatibility table above. You can also verify the OEM part number (68T-85540-00) using your engine's parts diagram or service manual.

Q: What are the symptoms of a failing C.D.I. unit?
A: Common signs include difficulty starting, inconsistent spark, engine misfires, rough idling, or complete loss of ignition. If spark plugs and ignition coils are functioning but the engine still won't fire, the C.D.I. unit may be the issue.

Q: How often should I replace the C.D.I. unit?
A: C.D.I. units are not regular maintenance items and typically last many years. Replace only when you experience ignition failure or diagnostic testing confirms the unit is faulty.

Q: Can I install this myself, or do I need a technician?
A: Installation is straightforward for those with basic mechanical and electrical skills. However, if you're unfamiliar with outboard ignition systems, professional installation is recommended to avoid wiring errors.

Q: Will this work on 2-stroke Yamaha engines?
A: No, this C.D.I. unit is designed exclusively for 4-stroke Yamaha outboards in the F6, F8, F9.9, T8, and T9.9 series. Do not use on 2-stroke models.

Q: What's the difference between OEM and aftermarket C.D.I. units?
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.