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For 90 HP 3cyl Mercury/Mariner 1987-92 models with Serial # OA996142 thru OC221999 and 1993-96 3cyl Sport Jet models with Serial # OE021000 thru OE145579, 174-8778K1 is an ignition stator. Helps maintain stable spark energy across the operating range.
Representative image shown. Brand or product appearance may vary slightly depending on current inventory.

Part #: 174-8778K1
Mercury90 HPStatorWeight: 4 lb
3.0 / 5  (5 votes)
For 90 HP 3cyl Mercury/Mariner 1987-92 models with Serial # OA996142 thru OC221999 and 1993-96 3cyl Sport Jet models with Serial # OE021000 thru OE145579, 174-8778K1 is an ignition stator. Helps maintain stable spark energy across the operating range.

Notes:

Models with 9amp charging system. Not for use with flywheels having bolted in magnets. Compatible with voltage regulator or rectifier.

List Price: $491.49
Your Price: $473.65
Normally In Stock

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

Replaces OEM#'s

398-8778A6, 398-8778A10, 398-8778A16, 398-8778A17, 398-8778A18, 398-8778A21, 398-8778A22, 398-8778A23, 398-8778A24, 398-8778A25, 398-8778A26, 398-8778A27, 398-8778A28, 398-8778A29, 398-818535A3, 398-818535A5, 398-818535A8, 398-818535A9, 398-818535A10, 398-818535A13, 398-818535A14

Product Details

Engineered for reliable marine ignition operation, this stator helps restore proper voltage generation when the original assembly becomes weak, heat-sensitive, or unstable. The design priorities are especially important on Mercury/Mariner applications where ignition stability depends on clean stator output.

Stator Design

  • Laminated core sections help concentrate magnetic flux from the flywheel magnets for reliable electrical production.
  • High-temperature insulation helps protect the windings from heat cycling inside the engine cowling.
  • Sealed construction helps reduce moisture intrusion that can lead to weak spark or no-spark conditions.
  • Precision-wound copper coils are used to promote efficient voltage generation and stable output.

Ignition System Benefits

  • Helps correct intermittent spark loss caused by heat-sensitive stator windings.
  • Helps reduce high-RPM breakup caused by weak or unstable stator output.
  • Supports dependable starting by delivering the voltage needed by the ignition module.
  • Engineered to meet OEM-style electrical output characteristics.

Problems a Weak Stator Can Cause

  • Weak or intermittent spark
  • Spark loss after warm-up
  • Random cylinder drop-out
  • High-rpm breakup
  • Hard starting

A stator should be diagnosed as part of the complete ignition system so related components are not overlooked.

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.