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134-9021-4 is an ignition trigger for 100 HP 4cyl Mercury/Mariner 1988-96 models with Serial # OB209468 thru OG437999. Provides the timing signal needed for accurate spark delivery.
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Part #: 134-9021-4
Mercury100 HPTriggerWeight: 1 lb
4.0 / 5  (8 votes)
134-9021-4 is an ignition trigger for 100 HP 4cyl Mercury/Mariner 1988-96 models with Serial # OB209468 thru OG437999. Provides the timing signal needed for accurate spark delivery.
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.

Precision magnetic pickup components and sealed marine-grade construction help resist moisture intrusion, corrosion, and damaging engine vibration.

Features

  • Designed for stable spark synchronization
  • Precision ignition timing signal generation
  • Helps support dependable throttle response
  • Marine-grade sealed construction

Common Symptoms of a Failing Trigger

  • Ignition timing drift after warm-up
  • Loss of spark synchronization
  • Intermittent ignition timing problems
  • RPM instability under load

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.