Somusen dual plug ignition coil for Johnson Evinrude OMC 1987-1999 — fits 2–175HP, OEM cross-reference

Somusen 583740 dual plug wire ignition coil delivers reliable spark generation for compatible Johnson, Evinrude and OMC outboard engines from 2HP up to 175HP.

When an outboard engine misfires, stumbles at idle, or loses top-end performance, the ignition coil is often the culprit. This Somusen replacement coil is engineered to match common OEM fitments (0583740, 583740, 583298, 879614, 18-5170, 183-3740) and works across a wide range of 2-, 4- and 6-cylinder Johnson/Evinrude/OMC motors built between 1987 and 1999. It aims to restore consistent spark delivery and dependable starting without the premium cost of an original manufacturer part.

How will this coil affect starting and running?

Installing a healthy ignition coil helps re-establish a strong, consistent high-voltage pulse to the spark plugs. That improves cold starts, reduces misfires and supports smoother acceleration across the rev range. It doesn’t change engine timing or tuning, but it supplies the robust spark those systems require.

• Restores reliable spark for quicker cold starts and fewer stalls.
• Helps maintain steady idle and smooth throttle response.
• Supports full horsepower potential up to 175HP when paired with healthy plugs and wiring.

Is this Somusen coil compatible with my outboard model?

This coil fits many Johnson, Evinrude and OMC outboards built from 1987 through 1999, covering small 2HP units up to larger 175HP engines. Check the part numbers stamped on your original coil (0583740, 583740, 583298, 879614, 18-5170, 183-3740) for a direct match. Verify cylinder count and connector style to be certain of fit.

• Covered part numbers included for quick cross-reference.
• Works with 2-, 4- and 6-cylinder configurations.
• Designed for outboards from model years 1987–1999.

What should I expect during installation and maintenance?

Installation follows standard ignition-coil replacement steps: remove battery ground, disconnect old coil leads, swap the mounting and plug in matching connectors, then recheck routing and clearances. Use proper torque on fasteners and inspect spark plug wires and caps while you’re servicing the coil. No special tuning is required after installation.

• Simple bolt-on replacement for like-for-like coil assemblies.
• Inspect and replace spark plug wires or caps if aged or cracked.
• Re-test ignition system and perform a sea trial to confirm performance.

How durable is this replacement coil and what support comes with it?

Constructed from quality materials and factory tested, the Somusen coil is built to withstand the vibration and moisture exposure typical of marine environments. It’s manufactured to match OEM form and function so it can be a dependable long-term service part when installed correctly. Somusen also offers customer support for questions after purchase.

• Engineered to meet durability expectations for marine ignition components.
• Factory-tested before shipping to reduce early failures.
• Customer support available for installation or fitment queries.

Who is this for: Marine DIYers, inboard/outboard mechanics and fleet owners who need a cost-effective replacement ignition coil for late‑80s to late‑90s Johnson, Evinrude and OMC outboards. If you’re troubleshooting misfires, intermittent starting, or loss of power and your original coil carries one of the listed part numbers, this Somusen 583740 coil is a practical, ready-to-install option to restore ignition reliability.