Mercury Mariner 35-40HP 2-Stroke Starter 12V 10-Tooth 1980-87
5728N
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Starter motor for selected Mercury and Mariner 35-40HP two-strokes
A 12V replacement starter for selected 33.3cu in two-cylinder Mercury and Mariner two-stroke outboards. The unit uses counter-clockwise rotation and a 10-tooth pinion for the early-1980s applications listed below.
Best used for: electric-start repair on compatible classic fishing boats, runabouts, RIBs and utility craft powered by Mercury or Mariner two-cylinder two-stroke outboards.
Technical specification
| System voltage | 12V |
| Rotation | Counter-clockwise (CCW) |
| Pinion | 10 teeth |
| Pinion outside diameter | Approximately 32.3mm |
| Starter design | Permanent-magnet direct drive (PMDD) |
| Approximate housing length | 104mm |
| Engine family | 33.3cu in two-cylinder two-stroke outboard |
Engine compatibility and applications
- Mercury/Mariner 35HP two-cylinder two-stroke: selected 1984-1987 applications.
- Mercury/Mariner 40HP two-cylinder two-stroke: selected 1980-1983 applications.
- Confirm the full serial range and original starter because Mercury/Mariner used multiple 35-40HP engine families.
- Not for later three-cylinder or four-stroke engines and not for applications with a different pinion or rotation.
Compatibility rule: confirm the complete engine model, year/serial range, voltage, rotation, pinion, mounting arrangement and an OEM reference. Horsepower or appearance alone is not sufficient.
OEM references, checks and installation
- Mercury Marine: 50-41583, 50-41583T.
- Sierra Marine: 18-6828.
- ARCO Marine: 5385; API: MOT3010.
Before fitting: isolate the battery, label the cables, compare both starters, inspect the flywheel ring gear and confirm clean, sound high-current connections.
Installation: follow the engine manufacturer's service procedure and torque values. Professional marine installation is recommended.
Package contents: one new replacement starter motor. External cables and mounting hardware are not included unless explicitly shown and stated.
Frequently asked questions
Does it fit all Mercury 35HP or 40HP engines?
No. It is for selected early two-cylinder two-strokes; check model, serial, original number and every physical specification.
How many teeth should my original starter have?
The compatible application requires a 10-tooth pinion. Do not fit it where the original tooth count differs.
Is this suitable for a four-stroke outboard?
No. The listed applications are two-cylinder two-stroke engines from the stated periods.
Does the starter drive come fitted?
The product is supplied as the complete starter motor shown, including its fitted 10-tooth drive. Compare the photographs with the old unit.
Important: OEM names and numbers are compatibility references only. This is a replacement component unless expressly described as genuine OEM.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
