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134-9021-4 is an ignition trigger for 115 HP 4cyl Mercury/Mariner 1989-97 models with Serial # OC100000 thru OG437999. Helps diagnose and correct ignition timing faults related to trigger failure.
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Part #: 134-9021-4
Mercury115 HPTriggerWeight: 1 lb
4.0 / 5  (23 votes)
134-9021-4 is an ignition trigger for 115 HP 4cyl Mercury/Mariner 1989-97 models with Serial # OC100000 thru OG437999. Helps diagnose and correct ignition timing faults related to trigger failure.
List Price: $140.99
Your Price: $125.95
Normally In Stock

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

Replaces OEM#'s

99021A2, 99021A6, 99021K2

Product Details

Designed for reliable ignition synchronization, this marine trigger helps coordinate spark timing events across the engine's RPM range.

The assembly uses vibration-resistant electronic components and insulated signal wiring designed for dependable timing performance in marine applications.

Features

  • Precision ignition timing signal generation
  • Designed for stable spark synchronization
  • Marine-grade sealed construction
  • Supports accurate CDI timing events

Common Symptoms of a Failing Trigger

  • Ignition timing drift after warm-up
  • Hard starting conditions
  • Intermittent ignition timing problems
  • Loss of spark synchronization

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.