4Boats
Starter Motor for Mercury Marine 40-60HP Outboard 50-73521 50-44369 SM47764
Starter Motor for Mercury Marine 40-60HP Outboard 50-73521 50-44369 SM47764
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Mercury Marine Starter Motor (50-73521)
Premium Quality Replacement for 40HP - 60HP Outboards
Restore reliable ignition to your Mercury or Mariner outboard with this heavy-duty 12-volt starter motor. Engineered to match the exact footprint and performance of the original United Technologies and Mercury Marine units, this starter ensures smooth, consistent cranking even in demanding marine environments.
Key Features
- ✔ Direct fit for 4-Cylinder Mercury Outboards
- ✔ High-torque 10-tooth drive gear
- ✔ Marine-grade corrosion resistant finish
- ✔ Counter-Clockwise (CCW) Rotation
Technical Specs
| Voltage: | 12V |
| Rotation: | CCW |
| Teeth: | 10-Tooth Pinion |
| Type: | PMDD |
| Gear OD: | 32.1mm / 1.264in |
| Housing Length: | 104.6mm / 4.118in |
Compatibility / Fitment Guide
| Application | Engine Details | Approx. Years |
|---|---|---|
| Mercury / Mariner 40HP | 4-Cylinder, 2-Stroke | 1989 - 1997 |
| Mercury / Mariner 45HP | 4-Cylinder, 2-Stroke | 1986 - 1989 |
| Mercury / Mariner 50HP | 4-Cylinder, 2-Stroke | 1976 - 1997 |
| Mercury / Mariner 60HP | 3 & 4-Cylinder Models | 1984 - 1997 |
OEM Cross Reference
| Mercury Marine | 50-73521, 50-44369, 50-44369A1, 50-73521T, 898265005 |
| United Technologies | 4820340, SM47764, SM48203, 4820340-M030SM |
| Sierra Marine | 18-5605, 18-5606 |
| Arco Marine | 5379, 5388 |
| API Marine | MOT3007N, MOT3013 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking the SKU/MPN and Cross Reference list provided above. If your original part number matches 50-73521 or SM47764, this is the correct replacement.
Which rotation direction does this starter have?
This starter motor features a Counter-Clockwise (CCW) rotation, which is specific to the classic Mercury 4-cylinder outboard configurations listed.
Note: Please verify your original part number against the references above before purchasing. All 4Boats aftermarket components are tested for durability in marine conditions.
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