# 878226T10 Mercury Flywheel | Genuine Used Part

🔧 Product Description

  

Genuine Mercury / Mariner 92-Tooth Magnetic Flywheel - Part Number: 878226T10

  

A genuine used magnetic flywheel for selected Mercury and Mariner 65 Jet, 75HP and 90HP three-cylinder two-stroke outboards with electric start and oil injection.

  

The flywheel features a 92-tooth starter ring and carries permanent magnets that generate ignition and charging current through the stator. Mercury 878226T10 replaces earlier flywheels 859234T12 and 9008A58.

  

⚙️ Key Features

  

• Genuine Mercury / Mariner magnetic flywheel

• Correct Mercury reference 878226T10

• 92-tooth starter ring gear

• Designed for electric-start, oil-injected engines

• Suits selected 65 Jet, 75HP and 90HP three-cylinder outboards

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 261-878226T10 → Supersedes 261-859234T12

• 261-859234T12 → Supersedes 261-9008A58

• 261-9008A58 earlier Mercury flywheel assembly

  

OEM / Related Numbers:

  

• 878226T10

• 261-878226T10

• 859234T12

• 261-859234T12

• 9008A58

• 261-9008A58

• Casting: 261-9007-C3

• Stator assembly according to engine serial range

• Trigger assembly according to engine serial range

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury and Mariner 65 Jet outboards

• Mercury and Mariner 75HP three-cylinder outboards

• Mercury and Mariner 90HP three-cylinder outboards

• Electric-start engines with factory oil injection

  

Typically suits:

  

• Engine models:

• Mercury 65 Jet three-cylinder two-stroke

• Mariner 65 Jet three-cylinder two-stroke

• Mercury 75HP three-cylinder two-stroke

• Mariner 75HP three-cylinder two-stroke

• Mercury 90HP three-cylinder two-stroke

• Mariner 90HP three-cylinder two-stroke

• USA and Belgium production engines whose flywheel diagram specifies 878226T10

• Electric-start and oil-injected configurations only

  

• HP Range: 65 Jet / 75HP - 90HP

• Engine Type: Three-cylinder carburetted, oil-injected two-stroke outboard

• Year Range: Approximately 1994 - 2006

  

🔌 Function

  

The flywheel provides starter engagement, rotating inertia and magnetic energy for the stator and ignition-trigger assemblies.

  

Common signs of failure:

  

• Starter teeth are worn or missing

• Magnets are cracked, loose or detached

• Battery charging output is low

• Ignition spark becomes intermittent

• Flywheel contacts the stator

• Crankshaft key or taper is damaged

• Excessive vibration or runout

• Rust or corrosion forms around the magnetic ring

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 100.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Flywheels | Engine Flywheels & Ring Gears

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 100.00 AUD | In stock |

## Images

- 878226T10 Mercury Flywheel | Genuine Used Part
- 878226T10 Mercury Flywheel | Genuine Used Part
- 878226T10 Mercury Flywheel | Genuine Used Part
- 878226T10 Mercury Flywheel | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/878226t10-mercury-flywheel-genuine-used-part)
> Updated: 2026-07-12