0581543 BRP Flywheel | Genuine Used Part

🔧 Product Description

Genuine OMC Evinrude Johnson 40HP to 60HP Three-Cylinder Flywheel Assembly - Part Number: 0581543

A genuine used OMC flywheel assembly for selected late-1970s Evinrude and Johnson three-cylinder outboards.

The flywheel is most commonly documented on 55HP engines but also appears in replacement-market application data for selected 40HP to 60HP engines from the same ignition family.

It carries the starter ring gear and internal magnets required by the engine's electric-start, ignition and charging systems.

⚙️ Key Features

• Genuine OMC Evinrude Johnson OEM flywheel

• Correct part number 0581543

• Unprefixed part reference 581543

• Used on selected late-1970s three-cylinder engines

• Integrated electric-start ring gear

• Internal permanent-magnet rotor

• Correct taper and keyway for compatible crankshafts

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 0581543 documented service reference

• 581543 unprefixed OMC reference

OEM / Related Numbers:

• 0581543

• 581543

• 0581537 / 581537 related flywheel reference appearing in replacement listings

• Related stator, timer-base, flywheel-key and flywheel-nut references

Aftermarket / Verified Equivalents:

• LC Powersports inspected replacement inventory SKU: 8397

• Outboard Exchange replacement reference: 581543

• Direct used replacement references: 0581543 and 581543

• Some replacement listings cross-search 581537; physical stamping and ignition configuration must be checked before interchange

🚤 Compatibility

Documented applications include:

• 1977 Evinrude 55HP - model 55E77D

• 1979 Johnson 55HP Seahorse - model 55EL79

• Selected 1976-1979 40HP to 60HP three-cylinder outboards using flywheel 581543

• Primary HP Application: 55HP

• Broader Documented Range: Approximately 40HP - 60HP

• Engine Type: OMC Evinrude Johnson three-cylinder carburetted two-stroke outboard

• Year Range: Approximately 1976 - 1979

🔌 Function

The flywheel supplies rotational inertia, engages with the starter motor and rotates its permanent magnets around the stator to produce ignition and charging voltage.

Common signs of failure:

• Starter-ring teeth are worn or missing

• Starter pinion does not engage correctly

• Flywheel taper is scored or fretted

• Keyway is damaged

• Magnets are loose or heavily corroded

• Charging output is low or inconsistent

• Ignition performance becomes erratic

• Flywheel has cracks, impact marks or distortion

Used-part inspection points:

• Compare the stamped number with the original flywheel

• Inspect the complete ring gear

• Check the crankshaft taper and keyway

• Confirm the internal magnet arrangement

• Do not interchange solely by horsepower

📦 Condition

• Genuine OMC used part

• Previously fitted and may show normal age-related marks, paint loss or oxidation

• Supplied as pictured

• Confirm the stamped flywheel number and ignition-system compatibility before installation