Spark Plug Wire, 9" – Fits Johnson/Evinrude V4-V6 10-235 HP Outboard Motors (Replaces 582365)

Spark Plug Wire, 9" – Fits Johnson/Evinrude V4-V6 10-235 HP Outboard Motors (Replaces 582365)

This high-performance 9-inch spark plug wire is engineered for Johnson/Evinrude 10–235 HP V4-V6 CROSSFLOW outboard engines manufactured in the 1980s and 1990s, fitting both 2-Stroke and 4-Stroke variants. It is designed to meet or exceed OEM specifications, ensuring reliable ignition and performance.

This component is a direct replacement for Sierra 18-5231-1, Johnson/Evinrude 582365, CDI 931-2365, Mallory 9-28005, and others, providing a high-quality alternative for routine maintenance or repair.

• Features a durable stainless steel wound conductor for optimal spark delivery.
• Constructed with premium silicone jacketing and boots for superior heat resistance and longevity.
• Engineered for superior RFI suppression to protect sensitive marine electronics.

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 Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Spark Plug Wire (Replaces 582365 / 18-5231-1)

Installation Guide

1. Ensure the engine is off and completely cool. Disconnect the negative battery terminal for safety.
2. Identify the spark plug wire to be replaced. Note its routing from the distributor/coil to the spark plug.
3. Gently twist the boot and pull it straight off the spark plug. Do not pull on the wire itself, as this can damage the terminal.
4. Disconnect the other end of the wire from the distributor cap or ignition coil.
5. Compare the new wire with the old one to ensure they are the same length and have the same style of boots.
6. Apply a small amount of dielectric grease to the inside of the new boots to prevent corrosion and ensure a tight seal.
7. Firmly press the spark plug boot onto the spark plug until you feel it click into place.
8. Connect the other end to the corresponding terminal on the distributor cap or coil, ensuring it is secure.
9. Reconnect the negative battery terminal.
10. Start the engine to verify proper operation and check for any rough idling or misfires.

Troubleshooting & FAQ

Q: How do I confirm this wire fits my Johnson/Evinrude engine?

A: This wire fits most V4-V6 CROSSFLOW engines from the 1980s-1990s, covering a wide range from 10-235 HP. The best way to confirm fitment is to match your existing part number to one listed in our cross-reference table, such as 582365 or Sierra 18-5231-1. You can also verify your engine model against the compatible models list on this page.

Q: What are the signs that a spark plug wire needs to be replaced?

A: Common signs of a failing spark plug wire include engine misfires, rough idling, difficulty starting, reduced acceleration, and poor fuel economy. You should also replace wires if you see any visible damage, such as cracks in the silicone jacketing, burn marks, or corrosion on the metal terminals.

Q: Is there a performance difference between this and the original OEM wire?

A: This is an aftermarket part built to meet or exceed OEM specifications. It features a durable stainless steel wound conductor, premium silicone jacketing, and excellent RFI suppression to deliver performance and longevity comparable to the original factory part.

Q: How often should I replace my outboard's spark plug wires?

A: There is no universal replacement interval, but it is good practice to inspect them annually for wear or damage. We recommend replacing them every few years as part of your regular engine maintenance schedule to ensure peak ignition performance and reliability.

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.