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134-9021-3 is an ignition trigger built for 55 HP 3cyl Mercury/Mariner 1992-97 models with Serial # OD000750 thru OG589999. Helps diagnose and correct ignition timing faults related to trigger failure.
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Part #: 134-9021-3
Mercury55 HPTriggerWeight: 1 lb
4.0 / 5  (13 votes)
134-9021-3 is an ignition trigger built for 55 HP 3cyl Mercury/Mariner 1992-97 models with Serial # OD000750 thru OG589999. Helps diagnose and correct ignition timing faults related to trigger failure.
List Price: $153.99
Your Price: $139.95
Normally In Stock

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

Replaces OEM#'s

99021A3, 99021A5, 99021A9, 99021A13, 99021A15, 99021A16

Product Details

Built for harsh outboard environments, this trigger assembly supports stable ignition timing and dependable CDI signal generation.

Marine-grade insulation materials and sealed pickup circuitry help protect the trigger assembly from humidity, heat cycling, and electrical interference.

Features

  • Supports accurate CDI timing events
  • Helps support dependable throttle response
  • Vibration-resistant electronic components
  • Designed for stable spark synchronization

Common Symptoms of a Failing Trigger

  • Loss of spark synchronization
  • Hard starting conditions
  • RPM instability under load
  • Ignition timing drift after warm-up

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.