# 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

## Details

- **Price:** 37.5 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Flywheels | Engine Flywheels & Ring Gears

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 37.50 AUD | In stock |

## Images

- 6105A9 Mercury Flywheel | Genuine Used Part
- 6105A9 Mercury Flywheel | Genuine Used Part
- 6105A9 Mercury Flywheel | Genuine Used Part
- 6105A9 Mercury Flywheel | Genuine Used Part
- 6105A9 Mercury Flywheel | Genuine Used Part
- 6105A9 Mercury Flywheel | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/6105a9-mercury-flywheel-genuine-used-part)
> Updated: 2026-07-12