High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats
High-Quality Ignition Coil for Mercury Mariner Outboard 8 hp, 9.9 hp, 13.5 hp, 15 hp (855685, 855685T) - 4Boats

Ignition Coil for Mercury Mariner Yamaha 9.9 15 HP 4-Stroke 66M-85570-00 855685T

855685

  • Dispatched in 2-3 days
  • 30 Day Return Policy
  • Low stock - 2 items left
  • Backordered, shipping soon
Our stock levels are dynamic and can change frequently. If a product appears to be in stock, it may have already sold out. Please contact us if you have any questions about availability. Thank you for your understanding.
£69.99
/
Tax included.

Ignition Coil 66M-85570-00

For Mercury, Mariner & Yamaha 4-Stroke Outboards

Restore peak performance and reliable starting to your outboard with this premium replacement ignition coil. Specifically engineered for the 323cc powerheads used in Mercury, Mariner, and Yamaha 4-stroke engines, this unit provides the high-voltage spark necessary for efficient combustion and smooth idling.

RELIABILITY: Manufactured with high-grade copper windings and marine-spec insulation to withstand high temperatures and vibration.

Key Features

  • ✔ Direct fit replacement for OEM 66M-85570
  • ✔ Complete assembly with HT lead
  • ✔ Corrosion-resistant mounting bracket
  • ✔ Improved cold-start reliability

Technical Specs

Voltage: 12V
Engine Type: 4-Stroke (2 Cylinder)
Material: ABS & High-Grade Copper
Terminal Type: Blade Terminal

Compatibility / Fitment Guide

Make Model Application Year/Notes
Mercury / Mariner 8HP, 9.9HP, 13.5HP, 15HP (4-Stroke) Approx. 1998–2006
Yamaha F9.9, T9.9, F15 1998–2006 (F15 98-05)
Parsun F9.9, F15 Clone Models

OEM Cross Reference

Yamaha: 66M-85570-00, 66M-85570-01, 66M-85570-02, 66M-85570-03
Mercury / Mariner: 855685, 855685T, 8251012, 825101
Sierra Marine: 18-23601

Questions & Answers

Is this a genuine original part?

This is a premium quality 4Boats aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and spark output.

How do I know if it is compatible?

Please check the part number stamped on your original coil. If it matches 66M-85570 or the Mercury 855685 reference, this part is the correct replacement.

Does it include the spark plug cap?

This unit comes as shown with the high-tension lead. You may need to transfer your existing spark plug cap or install a new one depending on your specific engine lead configuration.

Note: Professional installation is recommended. Please verify your original part number against the references above at 4boats.co.uk before purchasing.

For the products under £150 the shipping is £6.99.

Free delivery for most items over £150.

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