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For 25 HP XD Mercury/Mariner 1998-2006 models with Serial # OG760300 thru OT979999, 174-5721 is an ignition stator. Helps restore spark when the original stator output becomes weak or unstable.
Representative image shown. Brand or product appearance may vary slightly depending on current inventory.

Part #: 174-5721
Mercury25 HPStatorWeight: 2 lb
4.0 / 5  (11 votes)
For 25 HP XD Mercury/Mariner 1998-2006 models with Serial # OG760300 thru OT979999, 174-5721 is an ignition stator. Helps restore spark when the original stator output becomes weak or unstable.
List Price: $209.39
Your Price: $190.55
Normally In Stock

In Stock items ship same day if ordered before 3PM CST (excluding weekends and holidays)

Replaces OEM#'s

855721A4, 855721T8

Product Details

A properly functioning stator is critical to reliable spark production, and this assembly is built to deliver steady voltage under demanding marine operating conditions. The design priorities are especially important on Mercury/Mariner applications where ignition stability depends on clean stator output.

Construction Details

  • Marine-grade lead wires and molded connectors help maintain dependable contact in a high-vibration environment.
  • High-temperature insulation helps protect the windings from heat cycling inside the engine cowling.
  • Heavy-duty winding insulation helps prevent shorting between coil layers during extended operation.
  • Epoxy encapsulation helps shield internal windings from moisture, vibration, and corrosion.

Key Functional Details

  • Supports dependable starting by delivering the voltage needed by the ignition module.
  • Designed to maintain stable voltage as engine load and RPM change.
  • Designed for use in wet, hot, and vibration-heavy marine engine compartments.
  • Provides a dependable electrical source for the ignition system under real-world boating conditions.

Problems a Weak Stator Can Cause

  • Charging output problems where the stator also supports charging circuits
  • Spark loss after warm-up
  • No-start conditions
  • Random cylinder drop-out
  • Weak or intermittent spark

Because stator failure can mimic other ignition problems, testing the trigger, coils, switch box or power pack, and related grounds is recommended.

Need Fitment Help?

Tell us your brand, horsepower, and part number. We can help verify fitment before you order.

Support PDF files appear on this page when available.