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9-Tooth Starter Motor for Polaris Sportsman Scrambler Xplorer Trail Boss 3084403
9-Tooth Starter Motor for Polaris Sportsman Scrambler Xplorer Trail Boss 3084403
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Product Overview
Replace a worn, weak, noisy, or failed starter motor with this 9-tooth electric starter motor, designed for select Polaris Sportsman, Scrambler, Trail Boss, Trail Blazer, Xplorer, Xpress, Sport, and Big Boss ATV applications using reference numbers 3084403, 3085393, and 18331.
The starter motor helps crank the engine when the electric start button is pressed. A failing starter motor may cause slow cranking, clicking, intermittent starting, no-crank issues, grinding noise, or failure to start even when the battery is charged.
This replacement starter motor features a 9-tooth gear, CW rotation, 136mm length, 55mm diameter, 5mm mounting hole diameter, and multiple mounting hole distances based on supplied product data. Please compare your original starter motor’s OEM number, tooth count, rotation direction, mounting points, electrical terminal, body shape, gear position, and overall dimensions before ordering.
Product Compatibility
| Make | Model | Year Range | OEM / Reference Number | Fitment Notes |
|---|---|---|---|---|
| Polaris | Sportsman 400 | 1994–1996 | 3084403 / 3085393 / 18331 | Main fitment; confirm original starter gear and body shape |
| Polaris | Sportsman 400L | Select applications | 3084403 / 3085393 | Verify tooth count, rotation, and mounting points |
| Polaris | Scrambler 250 | 1985–1986 | 3084403 / 3085393 | Possible related fitment; compare original starter before ordering |
| Polaris | Scrambler 400 | 1995–2002 | 3084403 / 3085393 / 18331 | Main Scrambler fitment; match by OEM number and starter body |
| Polaris | Trail Blazer 250 | 1996–2006 | 3084403 / 3085393 | Common related fitment; confirm mounting layout |
| Polaris | Trail Boss 250 / 300 / 350L | Select applications | 3084403 / 3085393 / 18331 | Verify original starter motor before purchase |
| Polaris | Xplorer 250 | 2000–2002 | 3084403 / 3085393 | Match by gear count, rotation, and mounting design |
| Polaris | Xplorer 300 | 1996–2000 | 3084403 / 3085393 | Common related fitment; compare starter body and terminal |
| Polaris | Xplorer 400 / 400L | Select 1996–1998 applications | 3085393 / 3084403 | Verify original starter assembly and mounting points |
| Polaris | Xpress 300 / 400L | Select applications | 3084403 / 3085393 | Possible related fitment; check original part number |
| Polaris | Sport 400L | 1994–1999 | 3084403 / 3085393 | Common related fitment; confirm before ordering |
| Polaris | Big Boss 250 | 1989–1993 | 3084403 / 3085393 / 18331 | Possible related fitment; compare original starter before purchase |
Important Fitment Note:
This part is not selected by model name alone. Polaris Sportsman, Scrambler, Trail Boss, Trail Blazer, Xplorer, Xpress, Sport, and Big Boss models may use different starter motors depending on year, engine size, drive type, 2-stroke / 4-stroke setup, gear count, rotation direction, mounting points, and electrical terminal style. Please confirm your original starter motor matches the listed OEM/reference number, 9-tooth gear, CW rotation, and overall shape before ordering.
Specifications
| Specification | Details |
| Product Type | Electric Starter Motor |
| Compatible Brand | Polaris |
| Main Compatible Platforms | Sportsman, Scrambler, Trail Boss, Trail Blazer, Xplorer, Big Boss |
| Common Engine Range | Select 250cc / 300cc / 350cc / 400cc Polaris ATV applications |
| Tooth Count | 9 Teeth |
| Rotation Direction | CW |
| Length | 136mm / 5.4" |
| Diameter | 55mm / 2.2" |
| Mounting Hole Diameter | 5mm / 0.20" |
| Mounting Hole Distance | 78mm / 3.1", 57mm / 2.2", 66mm / 2.6" |
| Main OEM References | 3084403 / 3085393 |
| Aftermarket Reference | 18331 |
| Common Voltage | 12V ATV Starting System |
| Application | Electric Starting System |
| Fitment Type | Replacement, match by OEM number, tooth count, rotation, and mounting style |
Key Features
- 9-tooth electric starter motor for select Polaris ATV applications
- Designed for matching Sportsman, Scrambler, Xplorer, Trail Boss, Trail Blazer, Sport, Xpress, and Big Boss starter systems
- Replaces common Polaris starter references 3084403 and 3085393
- Cross-referenced with aftermarket starter number 18331
- Helps restore electric start function when the original starter motor is weak, worn, noisy, or failed
- Precision-built replacement style supports stable cranking performance
- Durable starter motor construction supports long service life under normal use
- Direct replacement style, but original gear count, rotation direction, terminal type, and mounting layout must be checked before installation
OEM Cross Reference
| OEM / Reference Number | Notes |
| 3084403 | Common Polaris starter motor reference |
| 308-4403 | Alternate hyphenated format |
| 3085393 | Common Polaris starter motor reference |
| 308-5393 | Alternate hyphenated format |
| 18331 | Common aftermarket starter motor reference |
| 18331N | Common aftermarket starter motor reference |
| SM13298 | Common aftermarket starter motor reference |
| SMU0034 | Common aftermarket starter motor reference |
| 71-26-18331 | Common aftermarket starter motor reference |
| 191-110 | Common aftermarket starter motor reference |
| 191-110A | Common aftermarket starter motor reference |
| SM-8 | Common aftermarket starter motor reference |
Please use the OEM/reference number together with physical fitment checks. If your original starter motor has a different gear tooth count, rotation direction, shaft style, mounting hole layout, electrical terminal, body diameter, body length, or mounting position, this part may not fit.
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Passform-FAQ
Passt dieses Teil zu meinem spezifischen Modell und Baujahr?
This starter motor is designed for select Polaris Sportsman, Scrambler, Trail Boss, Trail Blazer, Xplorer, Xpress, Sport, and Big Boss ATV applications when the original starter matches the listed OEM references and 9-tooth CW design. Because this starter covers multiple older Polaris ATV platforms, please confirm your exact model, year, engine size, drive type, original starter number, tooth count, rotation direction, and body shape before ordering.
Muss ich die OEM-Teilenummer verwenden?
Yes, matching the OEM or reference number is strongly recommended. This starter motor replaces common Polaris references 3084403 and 3085393, along with aftermarket reference 18331. However, OEM number alone is not enough. Please also confirm the 9-tooth gear, CW rotation, mounting hole layout, shaft position, body length, body diameter, and terminal style.
Für welche Modelle oder Situationen passt dieser Teil nicht?
This part does not fit Polaris Sportsman, Scrambler, Xplorer, Trail Boss, Trail Blazer, Big Boss, Ranger, RZR, Magnum, ATP, or other Polaris models that use a different starter gear count, different rotation direction, different shaft length, different mounting holes, different terminal style, or different starter body. It is also not a replacement for the battery, starter relay, starter clutch, stator, ignition coil, CDI / ECU, or complete wiring harness.
Was sollte ich vor der Bestellung überprüfen?
Before ordering, please check your ATV’s make, model, year, engine size, drive type, original starter motor OEM number, tooth count, rotation direction, mounting hole layout, mounting hole diameter, electrical terminal, shaft position, starter body length, starter body diameter, and available installation space. For best fitment, compare the product photos and specifications with your original starter motor before purchase.