9-Tooth Starter Motor for Polaris Sportsman Scrambler Xplorer Trail Boss 3084403

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.