Ignition Coil – Fits Yamaha Outboard 9.9HP 15HP 20HP 25HP 30HP 40HP (Replaces 66M-85570-00-00)

Ignition Coil – Fits Yamaha Outboard 9.9HP to 40HP (Replaces 66M-85570-00-00)

This ignition coil is designed for a wide range of Yamaha Outboard engines from 9.9HP to 40HP, covering various 2-stroke and 4-stroke models manufactured between 1989 and 2009. It serves as a reliable aftermarket replacement, engineered to meet or exceed original equipment standards.

This component directly replaces Yamaha OEM part numbers: 66M-85570-00-00, 66M-85570, 6F5-85570-10, 6F5-85570-11, 6F5-85570-12, and 6F5-85570-13. Please verify compatibility with your specific engine model using the cross-reference tables below.

• Installation Method: Direct fit, no modification required.
• Fuel Compatibility: Designed for gasoline engines.
• Core Function: High-performance coil ensures efficient spark generation for reliable ignition.

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.

Yamaha 2-Stroke Models

Yamaha 4-Stroke Models

Technical Specifications

Package Contents

• 1 x Ignition Coil (66M-85570-00-00)

Installation Guide

1. Safety First: Disconnect the battery cables (negative terminal first) to prevent electrical shock.
2. Locate the Coil: Find the existing ignition coil on the engine block. Note the routing of the spark plug wires and electrical connectors.
3. Disconnect Wires: Carefully unplug the spark plug wires from the coil. Then, disconnect the primary electrical connector(s).
4. Remove Old Coil: Unbolt the old ignition coil from its mounting bracket and remove it from the engine.
5. Install New Coil: Mount the new ignition coil securely onto the bracket and tighten the bolts to the manufacturer's recommended torque.
6. Reconnect Wires: Attach the primary electrical connector(s) and securely re-seat the spark plug wires onto the new coil terminals.
7. Reconnect Battery: Reconnect the battery cables (positive terminal first, then negative).
8. Test Operation: Start the engine and check for smooth idling and proper function.

Troubleshooting & FAQ

Q: How do I confirm this ignition coil fits my engine?

A: The best way is to compare your original part number to the numbers listed in our cross-reference table. You should also check your specific engine model and year against our detailed compatibility tables. Use our linked Yamaha serial number guides to verify your engine details.

Q: What are the common signs of a failing ignition coil?

A: Common symptoms include engine misfires (especially under load), difficulty starting, rough idling, reduced power, and decreased fuel efficiency. In some cases, a bad coil can trigger a check engine light.

Q: Does this coil fit both 2-stroke and 4-stroke Yamaha models?

A: Yes, this part is designed to fit a wide range of both 2-stroke and 4-stroke Yamaha outboards. Please refer to the specific compatibility tables above to ensure your exact model is listed.

Q: OEM vs. Aftermarket?

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.