CDI NEW Trigger Timer Base 134-9021-4 For: Mercury Mariner 80-125HP 4Cyl 0810

CDI Electronics Trigger Assembly (Timer Base) — Part Number 134-9021-4
Brand: CDI Electronics | Condition: New Old Stock (NOS)

You are purchasing a new CDI Electronics Trigger Assembly (Timer Base), part number 134-9021-4, for Mercury and Mariner 4-cylinder 2-stroke outboard engines. This is a genuine CDI Electronics branded part — never installed, never used.

Condition Details:

This is a New Old Stock (NOS) part. The trigger assembly itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.

Part Number / Supersede Information:

Primary Part Number: 134-9021-4
Now Replaced By: Sierra 18-99408 (following CDI/Sierra merger)
Replaces OEM Mercury: 99021A2 | 99021A6 | 99021K2

Fitment:

Fits Mercury / Mariner 4-cylinder 2-stroke outboards, 1988–1997, S/N 0D283222–0G437999:

• 80HP JET — 1994–1996
• 100HP — 1988–1996
• 115HP — 1989–1997 (9 Amp and 16 Amp applications)
• 125HP — 1994–1996 (9 Amp and 16 Amp applications)
• Please verify fitment using your motor's model and serial number before ordering

Why Choose Quality Replacement Parts?

CDI Electronics has been a trusted leader in marine ignition systems for over 35 years, engineering replacement triggers that meet or exceed OEM performance standards. Each CDI unit is purpose-built for marine environments and backed by CDI's 2-year limited warranty.

Returns:

We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.

Thank you for choosing QBS Parts Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience. Please verify fitment using your motor's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!

QBS Parts, Inc. — Gardena, CA