BH-Motor Ignition Coil for Johnson & Evinrude 4–300HP — Direct-Fit Replacement (Replaces 582508)

High-performance replacement ignition coil by BH-Motor engineered to fit Johnson and Evinrude outboards from 4HP up to 300HP, replacing part numbers 582508, 18-5179, and 183-2508.

This ignition coil is a direct-fit aftermarket replacement designed to restore spark reliability and consistent ignition timing on a wide range of Johnson and Evinrude outboard engines produced between the mid-1980s and early 2000s. Built to match OEM electrical characteristics and mounting points, the unit is intended for technicians and boat owners who need a dependable coil without sourcing original-brand stock. Below you’ll find fitment details, performance considerations, installation pointers, and who benefits most from this part.

Which Johnson and Evinrude models will this coil fit?

The BH-Motor coil is compatible with many Johnson and Evinrude outboards across small to large horsepower ranges. Fitment covers various models from 4HP through 300HP across production years commonly used in recreational and light commercial boats.

• Replaces OEM part numbers: 582508, 18-5179, 183-2508.
• Common compatible engines: Johnson/Evinrude 4hp Deluxe (1985–1999), 25hp (1985–1999), 30hp (1985–1999), 60hp (1985–2001).
• Also fits many intermediate models in the 4–300HP range; check engine serial/catalog info for confirmation.

How does this coil improve engine starting and performance?

By restoring proper secondary voltage and consistent spark timing, a good ignition coil helps reduce misfires, hard starting, and rough idling. This replacement is manufactured to reproduce the coil’s original electrical output and insulation for reliable performance under marine conditions.

• Delivers consistent high-voltage output to the spark plugs for dependable combustion.
• Designed to withstand saltwater environment stresses with durable insulation.
• Reduces erratic firing that causes sluggish starting or surging at various RPMs.

What should I know before buying and installing this coil?

Confirming engine model, year, and the original part number is the simplest way to ensure correct fitment. Installation requires basic mechanical skills and simple hand tools; some models may need rotor removal or access through the flywheel area.

• Verify part compatibility against your engine serial or OEM part list before purchase.
• Disconnect battery and follow manufacturer safety steps before starting work.
• Typical installation involves mounting the coil and connecting primary/secondary leads to existing harnesses.

How long can I expect this coil to last, and how do I care for it?

Service life varies with usage, moisture exposure, and electrical system condition; operating in corrosive marine environments reduces lifespan if seals or wiring are compromised. Regular inspection and keeping connectors clean will extend reliable service.

• Inspect coil and wiring periodically for corrosion, cracks, or loose connections.
• Replace spark plug wires and boots if brittle or damaged to avoid extra load on the coil.
• If engine shows recurring ignition issues, test coil resistance and secondary voltage with proper tools.

Who is this for? This BH-Motor ignition coil is aimed at boat owners, marine mechanics, and restoration specialists seeking a cost-effective, OEM-replacement-quality coil for Johnson and Evinrude outboards manufactured approximately between 1985 and 2001. It suits anyone needing a direct-fit swap for common OEM part numbers 582508, 18-5179, or 183-2508 to bring an inboard/outboard engine back to reliable operation without sourcing discontinued factory parts.