Starter Motor for Mercury Outboard 30-50 HP 1965-1983 - 12V CCW 9-Tooth
Starter Motor for Mercury Outboard 30-50 HP 1965-1983 - 12V CCW 9-Tooth
SKU:410-21000
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Starter Motor for Mercury Outboard 30-50 HP 1965-1983 - 12V CCW 9-Tooth
Mercury Marine Outboards 30, 35, 40, 45 & 50 HP - Permanent Magnet Direct Drive
A starter motor is the component that cranks the engine over to begin combustion. If it fails to engage, spins without turning the engine, or does not respond at all when the key is turned or the start button is pressed, the engine will not start. This starter motor is built for Mercury Marine outboards in the 30, 35, 40, 45 and 50 horsepower range, engineered as a direct replacement that matches the original unit's fit, mounting and function.
It is a 12V permanent magnet direct drive (PMDD) unit with counter-clockwise (CCW) rotation and a 9-tooth drive pinion, with a motor housing length of 4.119in matching the original Mercury outboard specification. It replaces Mercury Marine numbers 50-30829, 50-32403, 50-37345 and 50-38890A1 among others.
Key Features
- Direct fit for Mercury outboards 30-50 HP
- 12V starter motor, counter-clockwise (CCW) rotation
- 9-tooth drive pinion, permanent magnet direct drive
- Motor housing length 4.119in
- Replaces Mercury 50-38890A1 and Sierra 18-5601
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Rotation | Counter-Clockwise (CCW) |
| Teeth | 9 |
| Starter Type | PMDD (Permanent Magnet Direct Drive) |
| Motor Housing Length | 4.119in |
| Lester Reference | 5400 |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model | Years |
|---|---|
| Mercury Outboard 50 HP | 1965-1975 |
| Mercury Outboard 40 HP | 1970-1977 |
| Mercury Outboard 40E / 40EL 2-Stroke | 1978-1983 |
| Mercury Outboard 40EH / 40ELH 2-Stroke | 1981-1983 |
| Mercury Outboard 30, 35 and 45 HP | Not specified |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 50-30829, 50-32403, 50-37345, 50-38890, 50-38890A1, 50-55601A2, 50-55801A, 55601A2 | Mercury Marine |
| 18-5601, 18-5641 | Sierra Marine |
| 5366 | Arco Marine |
| 50-38890, MOT3001 | API Marine |
| SAB0004 | Arrowhead |
| 5400 | Lester |
| 2-2075-UT, 5400N | WAI |
| 0996140, M0551017, M0551017A, SM09961, SMH12B31 | United Tech |
| STR-1062, STR1062 | NSA / Unipoint / Wood Auto |
| 4-5601 | EMP Parts / MP Parts |
| 9-15001 | Mallory |
| S2062M | MES Motorcycle & Marine |
| 71-09-5400, 91-09-1009 | Wilson |
| 110241, MS-631, 49-0004, 690-007, 106-021, ST-5400, 57-2175, 011062 | Cargo / Dixie / EMS / Barsanco / PIC / RCP / Minnpar / Andre Niermann |
Frequently Asked Questions
Will this fit without modification?
Yes, this starter motor is built to match the original Mercury outboard unit's housing length, rotation and drive pinion, so it installs as a direct swap.
What's included?
One new 12V starter motor, ready to fit.
How do I know my old starter has failed?
Common signs are a single click with no crank, a slow or straining crank, or no response at all when the key is turned or the start button pressed.
How do I confirm this is the right starter for my outboard?
Check the motor housing length (4.119in) and rotation direction against your original unit, as Mercury used several housing lengths across its outboard range. The quickest confirmation is matching the number on your existing starter against 50-38890A1 or Sierra 18-5601 in the table above.
Does this suit both electric-start and tiller models?
Yes - the fitment covers both the 40E and 40EL electric-start models and the 40EH and 40ELH tiller-handle versions built from 1981 to 1983.
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