Aftermarket Ignition Coil for Yamaha Outboard 9.9HP–40HP — Replaces 66M-85570-00-00, 6F5-85570-10, 6F5-85570-11, 6F5-85570-12 and 6F5-85570-13

Product Details

This aftermarket ignition coil is designed as a replacement for selected Yamaha 2-stroke and 4-stroke outboard applications in the 9.9HP–40HP range. It is intended to provide reliable high-voltage output for spark generation and normal engine operation.

Reference numbers associated with this replacement include Yamaha part numbers 66M-85570-00-00, 66M-85570, 6F5-85570-10, 6F5-85570-11, 6F5-85570-12 and 6F5-85570-13. Confirm the part number, connector, mounting arrangement and engine model before ordering.

• Replacement ignition coil for selected Yamaha outboard engines.
• Designed for direct-fit replacement where the original part number and configuration match.
• Constructed with electronic components intended for dependable ignition service.
• One individual ignition coil is included.

Part Number Matrix

Use the following manufacturer reference numbers to compare your original component before purchase. These numbers should be matched together with the applicable engine model and configuration.

Engine and Model Compatibility

The applications below are the listed compatibility references for this replacement coil. Model suffixes, year ranges and engine configurations must remain consistent when checking fitment. Always compare the original coil and manufacturer part number before installation.

Yamaha 2-Stroke Outboards

Yamaha 4-Stroke Outboards

The following 4-stroke model references are listed for the 6F5-85570 series. Specific model-year and serial-number coverage is not stated here, so verify the original component and manufacturer part number before purchase.

Technical Specifications

Product Type

Ignition coil

Application

Selected Yamaha outboard engines

Engine Range

9.9HP–40HP applications listed above

Engine Types

Selected 2-stroke and 4-stroke outboards

Installation

Direct-fit replacement where the original part number and configuration match

Fuel Type

Gasoline

Construction

Electronic ignition-coil assembly

Warranty

1 year against manufacturing defects under normal use

What's in the Box

• 1 x Ignition coil

Installation Notes

1. Disconnect the battery and follow the engine manufacturer's safety procedures.
2. Locate the ignition coil and identify the high-voltage lead and low-voltage connector.
3. Disconnect the electrical connector and remove the spark-plug lead from the old coil.
4. Remove the coil mounting fasteners and take out the old component.
5. Inspect and clean the mounting surface and electrical connections.
6. Install the replacement coil in the original position and tighten the fasteners securely.
7. Reconnect the low-voltage connector and firmly attach the spark-plug lead.
8. Reconnect the battery if applicable and test the engine according to the service manual.

Troubleshooting and FAQ

Safety and Important Information

• Verify the complete engine model, year or serial range where applicable, original part number, connector and mounting arrangement before ordering.
• Do not rely on horsepower alone to determine compatibility.
• Disconnect the battery and follow the manufacturer's service procedures before installation.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended when ignition-system testing or electrical diagnosis is required.

About Sea Sierra

• Pro-Grade Standards — Marine replacement parts selected for dependable service and practical compatibility checking.
• Global Fulfillment — Shipping options and delivery estimates are displayed at checkout.
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