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Description

Johnson/Evinrude Flywheel 0583696 – 73-Tooth Flywheel Assembly for Electric Start 2-Cylinder Outboards

The Flywheel Assembly is used on select Electric Start Johnson and Evinrude 2-cylinder outboard engines as part of the ignition, charging, and starting system.

This flywheel is commonly identified as a 73-tooth assembly and is used on numerous OMC applications in the approximately 35–60 HP range, depending on model year and configuration.

The flywheel is more than just a rotating mass. It plays several important roles in the engine, including carrying the magnetic components used by the ignition and charging system, maintaining rotational inertia, and providing the ring gear that engages with the electric starter on applicable models.

What the Flywheel Does

The flywheel helps perform several important functions:

• Provides rotating mass to smooth engine operation
• Works with the stator and ignition components
• Carries the magnets used for ignition and charging
• Provides the starter ring gear on electric-start applications
• Maintains a fixed rotational relationship with the crankshaft
• Supports correct ignition timing reference

Because the flywheel is directly connected to the crankshaft, any damage or looseness can affect multiple engine systems at once.

Common Signs of a Damaged or Worn Flywheel

Possible symptoms or inspection findings may include:

• Starter gear slipping or grinding
• Damaged or missing ring gear teeth
• Cracked or loose magnets
• Ignition output problems
• Charging-system problems
• Abnormal vibration
• Flywheel wobble
• Damaged keyway
• Sheared flywheel key
• Scoring or fretting on the crankshaft taper
• Visible cracks or structural damage
• Difficulty keeping the flywheel securely torqued

These symptoms can also be caused by the starter, stator, timer base, power pack, crankshaft, or related ignition components, so proper inspection is recommended.

Why Flywheel Condition Matters

The flywheel must remain securely seated on the crankshaft taper and rotate true.

If the flywheel becomes loose or damaged, it can lead to:

• Ignition timing movement
• Crankshaft taper damage
• Keyway damage
• Vibration
• Starter engagement problems
• Magnet damage
• Stator damage
• Serious engine failure in severe cases

A damaged flywheel should not be reused simply because the engine still runs.

Key Features & Benefits

• 73-Tooth Ring Gear – Used on applicable electric-start Johnson/Evinrude engines
• 2-Cylinder Application – Commonly found on select 35–60 HP OMC outboards
• Ignition System Component – Works with the stator and magnetic ignition system
• Supports Electric Starting – Ring gear provides engagement for the starter pinion
• Maintains Rotational Stability – Provides flywheel mass for smooth engine operation
• Useful for Restoration & Repair – Ideal when replacing damaged ring gears, magnets, or taper assemblies

73-Tooth Ring Gear

One of the easiest physical identifiers of this flywheel is the 73-tooth starter ring gear.

If replacing an existing flywheel, confirm the tooth count before ordering. A mismatched ring gear can create starter engagement problems and may indicate that the wrong flywheel has been selected.

Inspect the Flywheel Before Installation

Before installing a replacement flywheel, inspect:

• Crankshaft taper
• Flywheel taper
• Keyway
• Flywheel key
• Ring gear teeth
• Magnets
• Magnet bonding
• Center hub
• Overall runout or distortion

Any damaged mating surface can prevent the flywheel from seating correctly.

Flywheel Key & Taper Considerations

The flywheel key helps locate the flywheel rotationally, but the crankshaft taper and proper nut torque provide the actual clamping force needed to hold the flywheel securely.

A loose flywheel can damage:

• Flywheel key
• Keyway
• Crankshaft taper
• Flywheel hub
• Ignition timing relationship

If a flywheel key has sheared, inspect the complete assembly before installing a new key and retightening the nut.

Performance & Racing Considerations

For performance and racing applications, flywheel condition is especially important because the engine operates at sustained high RPM.

At Liquid Revolutions, we know that any looseness, magnet damage, ring gear damage, or taper problem can quickly become a major reliability issue on a race engine.

A properly fitted and securely torqued flywheel helps maintain:

• Consistent ignition timing
• Reliable charging performance
• Smooth engine operation
• Proper starter engagement
• High-RPM reliability

Whether you’re restoring an older Johnson/Evinrude outboard or maintaining a performance engine, the flywheel is an important replacement option when the original flywheel is damaged or no longer serviceable.