Mercury Mariner 35-40HP 2-Stroke Starter 12V 10-Tooth 1980-87
5728N
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Mercury Mariner 35-40HP 2-Stroke Starter 12V 10-Tooth 1980-87
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 Specifications
| 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.
Questions & Answers
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.
