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

🔄 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

🚤 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 damage:

• 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

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

📦 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