# 855721T8 Mercury Stator | Genuine Used Part

🔧 Product Description

  

Genuine Mercury / Mariner Small Outboard Stator Assembly - Part Number: 855721T8

  

A genuine Mercury / Mariner stator assembly used on small 6HP to 25HP two-stroke outboards. This stator mounts under the flywheel and supplies ignition and charging output on compatible two-cylinder XD-series engine families.

  

⚙️ Key Features

  

• Genuine Mercury / Mariner stator assembly

• Correct Mercury part number 855721T8

• Related to 855721A4 stator reference

• Used on 6HP to 25HP two-stroke outboards

• Cross-references with CDI 174-5721 replacement family

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 855721T8 later Mercury stator assembly reference

• 855721A4 earlier / related Mercury stator assembly reference

  

OEM / Related Numbers:

  

• 855721T8

• 855721T 8

• 855721A4

• 855721A 4

• 398-855721T8 related service format

  

Aftermarket / Verified Equivalents:

  

• CDI Electronics: 174-5721

• Aftermarket reference: 855721T8

• Aftermarket reference: 855721A4

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner small two-stroke outboards

• Two-cylinder XD-series charging and ignition systems

  

Typically suits:

  

• Engine models:

• Mercury 6HP two-stroke applications where 855721T8 is specified

• Mercury 8HP two-stroke applications where 855721T8 is specified

• Mercury 9.9HP two-stroke applications where 855721T8 is specified

• Mercury 10HP two-stroke applications where 855721T8 is specified

• Mercury 15HP two-stroke applications where 855721T8 is specified

• Mercury 20HP two-stroke applications where 855721T8 is specified

• Mercury 25HP two-stroke applications where 855721T8 is specified

• Mariner 6HP / 8HP / 9.9HP / 15HP / 20HP / 25HP two-stroke applications using 855721T8

• Mercury / Mariner 2-cylinder XD two-stroke stator systems using 174-5721 replacement family

  

• HP Range: 6HP - 25HP

• Engine Type: Mercury / Mariner two-cylinder two-stroke outboard

• Year Range: approximately 1997-2005

• System Type: Stator / charging and ignition source coil assembly

  

🔌 Function

  

The stator generates electrical output beneath the flywheel. It supplies ignition energy and charging output needed for spark generation and electrical-system operation.

  

Common signs of failure:

  

• Weak or missing spark

• Battery not charging where charging circuit is fitted

• Hard starting

• Engine cuts out when warm

• Misfire at higher RPM

• Burnt windings or damaged stator wires

• Cracked insulation or corroded connector

• AC output below specification during testing

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 55.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Stators | Charging Stators & Electrical Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 55.00 AUD | In stock |

## Images

- 855721T8 Mercury Stator | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/855721t8-mercury-stator-genuine-used-part)
> Updated: 2026-07-06