339-856991A1 339-850227 Ignition Coil for Mercury EFI Optimax Sport Jet | JLM Marine

339-856991A1 339-850227 Ignition Coil for Mercury EFI Optimax Sport Jet | JLM Marine

Vendor: JLM Marine
Availability: In Stock
Product Type: Ignition Coil
$41.50
$41.50
Subtotal: $41.50

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339-856991A1 339-850227 Ignition Coil for Mercury EFI Optimax Sport Jet | JLM Marine

339-856991A1 339-850227 Ignition Coil for Mercury EFI Optimax Sport Jet | JLM Marine

$41.50
Descripción

Ignition Coil for Mercury EFI Optimax Sport Jet – Fits 135-250 HP 6-Cylinder Engines

This high-quality aftermarket ignition coil is engineered for Mercury EFI, Optimax, and Sport Jet outboard engines. Designed to fit 6-cylinder 2.5L and 3.0L models from 1998 to 2006, it delivers reliable spark performance for 135 HP to 250 HP applications.

This ignition coil directly replaces Mercury part numbers 339-856991A1, 339-850227, and Sierra part number 18-5187. It meets or exceeds OEM specifications for reliable engine operation.

  • Direct-fit replacement for Mercury 6-cylinder EFI, Optimax, and Sport Jet engines
  • Meets or exceeds OEM performance standards
  • Package includes one complete ignition coil assembly

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Mercury 339-856991A1
Mercury 339-850227
Sierra 18-5187

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Brand Model Rated HP Stroke Years
Mercury EFI 200 6 Cyl 2.5L 1998-2006
Mercury Optimax 135 6 Cyl 2.5L 1998-2006
Mercury Optimax 150 6 Cyl 2.5L 1998-2006
Mercury Optimax 175 6 Cyl 2.5L 2001-2006
Mercury EFI 225 6 Cyl 3.0L 1998-2006
Mercury Sport Jet 250 6 Cyl 3.0L 2002-2006

Technical Specifications

Specification Value
Part Type Ignition Coil
Application Mercury EFI, Optimax, Sport Jet Outboards
Engine Configuration 6-Cylinder
Displacement 2.5L / 3.0L
Compatible HP Range 135-250 HP
Quality Standard Meets or exceeds OEM specifications

Package Contents

  • 1 x Ignition Coil

Installation Guide

  1. Disconnect the negative battery cable to prevent electrical shock or short circuits.
  2. Locate the ignition coil on your engine; refer to your engine's service manual or parts diagram for exact positioning.
  3. Disconnect the spark plug wire from the old ignition coil. Label wires if multiple coils are present.
  4. Disconnect the electrical connector from the ignition coil.
  5. Remove the mounting bolts or screws securing the old ignition coil to the engine block.
  6. Carefully lift the old ignition coil away from the engine.
  7. Position the new ignition coil in the same location and align the mounting holes.
  8. Secure the new coil with the original mounting bolts or screws; tighten to manufacturer specifications.
  9. Reconnect the electrical connector firmly until it clicks into place.
  10. Attach the spark plug wire to the new ignition coil, ensuring a secure connection.
  11. Reconnect the negative battery cable.
  12. Start the engine and verify smooth operation with no misfires or rough idling.

Troubleshooting & FAQ

Q: How do I confirm this ignition coil fits my engine?
A: Check the Compatible Engine Models table above for your engine's brand, model, HP, and year range. You can also cross-reference the OEM part numbers (339-856991A1, 339-850227) with your original coil or consult your engine's parts diagram.

Q: What are the symptoms of a failing ignition coil?
A: Common signs include engine misfires, rough idling, difficulty starting, loss of power under load, and increased fuel consumption. If your engine runs poorly on certain cylinders, the ignition coil may be faulty.

Q: How often should I replace my ignition coil?
A: Ignition coils typically last several years under normal operating conditions. Replace them when you notice performance issues or during routine maintenance if they show signs of corrosion, cracking, or electrical failure.

Q: What is the difference between this aftermarket coil and the OEM version?
A: This aftermarket ignition coil is manufactured to meet or exceed OEM specifications using comparable materials and design. It provides reliable performance at a more competitive price point compared to OEM parts.

Q: Can I install this ignition coil myself?
A: If you have basic mechanical skills and tools, installation is straightforward. However, professional installation is recommended to ensure proper fitment, electrical connections, and optimal engine performance.

Q: Is this an OEM part or 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.
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Para nuestros clientes típicos de EE. UU. y Canadá , nuestros plazos de envío son los siguientes:

  • Amazon FBA : los pedidos se entregarán dentro de 1-5 días hábiles después de realizar el pedido (durante ciertos períodos especiales como promociones importantes, Navidad, etc., el tiempo de entrega de Amazon FBA puede verse afectado).
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Al realizar un pedido, estimaremos las fechas de envío y entrega según la disponibilidad de sus artículos y las opciones de envío que elija. Dependiendo del proveedor de envío que elija, las fechas de envío estimadas podrían aparecer en la página de presupuestos de envío.

Tenga en cuenta también que las tarifas de envío de muchos de los artículos que vendemos se basan en el peso. Puede consultar el peso de cada artículo en su página de detalles. Para reflejar las políticas de las empresas de envío que utilizamos, todos los pesos se redondearán a la libra superior.

Acerca de JLM Marine

Fundada en 2002, JLM Marine se ha consolidado como un fabricante dedicado de piezas marinas de alta calidad, con sede en China. Nuestro compromiso con la excelencia en la fabricación nos ha ganado la confianza de las principales marcas marinas a nivel mundial.

Como proveedor directo, evitamos intermediarios, lo que nos permite ofrecer precios competitivos sin comprometer la calidad. Este enfoque no solo promueve la rentabilidad, sino que también garantiza que nuestros clientes reciban el mejor valor directamente del proveedor.

Estamos entusiasmados de ampliar nuestro alcance a través de canales minoristas, llevando nuestra experiencia y compromiso con la calidad directamente a los propietarios de embarcaciones y entusiastas de todo el mundo.

Parts Finder

Use our Parts Finder to quickly locate the correct parts for your engine. Search by Make, HP, Stroke, Model, Year, and SN. Select only the fields available — you don’t need to fill all options (e.g., leave Year blank if not applicable).

Our database is currently being updated and expanded. More models, including Yamaha, Mercury, and Suzuki, are being verified and uploaded.
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