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CDI Ignition Module for Mercury Optimax 225XS 250XS 300XS
CDI Ignition Module for Mercury Optimax 225XS 250XS 300XS
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Product Overview
Replacement 5-pin CDI ignition module for selected Mercury Optimax high-performance outboard engines, including 225XS, 225 Sport XS, 250XS, 250 Sport XS, and 300XS applications.
Designed to replace Mercury / Mariner ignition-module references including 300-8M007747, 300-879984T01, 339-879984A1, and 339-879984T00.
This module uses a 5-pin connector and measures approximately 82mm across the main housing and 96mm overall, with a width of approximately 55mm, height of 45mm, and mounting-hole spacing of approximately 75mm.
Before ordering, match the OEM number, connector configuration, mounting dimensions, and original ignition module.
Product Compatibility
| Make | Model | Engine Family | OEM Reference |
|---|---|---|---|
| Mercury | Optimax 225XS | Optimax | Verify OEM number |
| Mercury | 225 Sport XS | Optimax / Sport XS | Verify OEM number |
| Mercury | Optimax 250XS | Optimax | Verify OEM number |
| Mercury | 250 Sport XS | Optimax / Sport XS | Verify OEM number |
| Mercury | Optimax 300XS | Optimax | Verify OEM number |
Because Mercury used different ignition components across engine serial ranges and configurations, model or horsepower alone should not be used to confirm fitment.
OEM Cross-Reference Numbers
Mercury / Mariner
- 300-8M007747
- 300-879984T01
- 339-879984A1
- 339-879984T00
When possible, match one of these references to the original ignition module before ordering.
Specifications
| Specification | Details |
|---|---|
| Product Type | CDI / Ignition Module |
| Connector | 5-Pin |
| Main Housing Length | Approx. 82 mm / 3.23 in |
| Overall Length | Approx. 96 mm / 3.78 in |
| Width | 55 mm / 2.17 in |
| Height | 45 mm / 1.77 in |
| Mounting Hole Distance | 75 mm / 2.95 in |
| Application | Mercury Optimax Outboard |
| Condition | New |
| Package Quantity | 1 Ignition Module |
Key Features
- 5-Pin Configuration: Designed for compatible Mercury Optimax ignition systems using a matching connector.
- Multiple OEM References: Cross-references 300-8M007747, 300-879984T01, 339-879984A1, and 339-879984T00.
- XS Outboard Applications: Intended for selected Mercury 225XS, 250XS, and 300XS engine applications.
- Fitment Reference Dimensions: Approximately 82mm main housing length, 96mm overall length, and 75mm mounting-hole spacing.
- Replacement Ignition Component: Designed as an aftermarket replacement for a failed or damaged compatible original module.
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Passform-FAQ
Passt dieses Teil zu meinem spezifischen Modell und Baujahr?
This module is intended for selected Mercury Optimax 225XS, 225 Sport XS, 250XS, 250 Sport XS, and 300XS outboard applications associated with the listed OEM references.
Mercury outboard fitment can vary by engine configuration and serial range, so do not rely on horsepower alone.
Muss ich die OEM-Teilenummer verwenden?
Yes. Matching the original part number is strongly recommended.
Compatible references include:
300-8M007747
300-879984T01
339-879984A1
339-879984T00
If your original module carries a different number, verify interchangeability before ordering.
Für welche Modelle oder Situationen passt dieser Teil nicht?
Do not assume this module fits:
Every Mercury 225HP outboard
Every Mercury 250HP outboard
Every Mercury 300HP outboard
Non-Optimax engines solely because horsepower matches
Modules using a different OEM reference
Applications with a different connector or pin arrangement
Modules with different mounting dimensions
Similar horsepower does not guarantee ignition-system compatibility.
Was sollte ich vor der Bestellung überprüfen?
Confirm:
Exact Mercury outboard model
Engine serial range where available
Original OEM part number
5-pin connector
Connector and terminal arrangement
Approx. 82mm main housing / 96mm overall length
Approx. 55mm width
Approx. 45mm height
Approx. 75mm mounting-hole distance
Original module appearance