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

🚤 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

🛠️ Service Notes

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

🔄 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

📦 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