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134-9021-3 is a replacement ignition trigger used on 90 HP 3cyl Mercury/Mariner 1987-96 models with Serial # OA996142 thru OG437999. Supports consistent spark timing on compatible 2-stroke outboards.
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Part #: 134-9021-3
Mercury90 HPTriggerWeight: 1 lb
4.0 / 5  (22 votes)
134-9021-3 is a replacement ignition trigger used on 90 HP 3cyl Mercury/Mariner 1987-96 models with Serial # OA996142 thru OG437999. Supports consistent spark timing on compatible 2-stroke outboards.
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

  • Vibration-resistant electronic components
  • Supports accurate CDI timing events
  • Precision ignition timing signal generation
  • Marine-grade sealed construction

Common Symptoms of a Failing Trigger

  • Hard starting conditions
  • Ignition timing drift after warm-up
  • RPM instability under load
  • Engine misfire or hesitation

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.