6105A9 Mercury Flywheel | Genuine Used Part

🔧 Product Description

Genuine Used Mercury 7.5HP / 9.8HP Manual-Start Flywheel - Part Number: 6105A9

A genuine pre-owned Mercury flywheel for selected twin-cylinder 7.5HP and 9.8HP manual-start two-stroke outboards.

The full component-style reference may be shown as 251-6105A9.

This flywheel does not use the large electric-starter ring gear found on electric-start assemblies. It carries the ignition magnets and recoil-starter engagement features required by compatible engines.

⚙️ Key Features

• Genuine Mercury used flywheel
• Correct OEM number 6105A9
• Full-format reference 251-6105A9
• Manual-start configuration
• Suitable for selected 7.5HP and 9.8HP twin-cylinder engines
• Used on Mercury 75 and Mercury 110 model families
• Original Mercury ignition rotor assembly

🚤 Compatibility

Commonly used on selected

• Mercury 7.5HP twin-cylinder outboards
• Mercury 9.8HP twin-cylinder outboards
• Mercury 75 models
• Mercury 110 models
• Manual-start engines from approximately 1979-1985

Important fitment note

• Confirm that the engine is manual start.
• Electric-start flywheels use a different ring-gear and charging arrangement.
• Compare the crankshaft taper, magnet layout and recoil-starter engagement profile.

🔌 Function

The flywheel stores rotating energy and causes its permanent magnets to pass the stator and trigger components.

⚠️ Common Signs of Failure

• Cracked or loose magnets
• Damaged keyway
• Flywheel taper is fretted
• Recoil-start engagement surfaces are worn
• Ignition output is weak
• Flywheel rubs the stator
• Visible wobble
• Corrosion develops around the hub

🛠️ Service Notes

Recommended checks before installation

• Confirm 6105A9 or 251-6105A9
• Inspect the taper and keyway
• Check all internal magnets
• Inspect the recoil-starter engagement points
• Check stator and trigger clearance
• Install with the correct flywheel key
• Torque the retaining nut correctly
• Test ignition output after installation

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 6105A9
• 251-6105A9
• Common casting reference: 236-38397
• Related flywheel references vary for electric-start engines
• OEM Description: Flywheel Assembly

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine Mercury used part
• Pre-owned rotating ignition component
• Cosmetic marks and surface corrosion may be present
• Magnets, taper and keyway must be inspected before installation
• Supplied in protective or equivalent packaging