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9-Tooth Starter Motor for Yamaha WR250F 2003–2014 5UM-81890-10
9-Tooth Starter Motor for Yamaha WR250F 2003–2014 5UM-81890-10
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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 Yamaha WR250F 250cc off-road motorcycle applications from 2003–2014.
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 and CW rotation 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 design before ordering.
Product Compatibility
| Make | Model | Year Range | OEM / Reference Number | Fitment Notes |
|---|---|---|---|---|
| Yamaha | WR250F | 2003–2009 | 5UM-81890-00 / 5UM-81890-10 / 5UM-81890-11 | Main fitment; confirm original starter gear and body shape |
| Yamaha | WR250F | 2010 | 5UM-81890-11 | Verify original starter motor before ordering |
| Yamaha | WR250F | 2011–2014 | 5UM-81890-10 / 5UM-81890-11 | Main fitment; match by OEM number, tooth count, and rotation |
| Yamaha | WR250F 250cc Off-Road Platform | Select 2003–2014 applications | 5UM-81890 series | Fitment depends on original starter motor version |
Important Fitment Note:
This part is not selected by model name alone. Yamaha WR250F models may use different starter motor versions depending on year, market, engine version, 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 | Yamaha |
| Main Compatible Model | WR250F |
| Main Compatible Year Range | 2003–2014 |
| Engine Platform | 250cc 4-Stroke Off-Road Motorcycle |
| Tooth Count | 9 Teeth |
| Rotation Direction | CW |
| Main OEM References | 5UM-81890-00 / 5UM-81890-10 / 5UM-81890-11 |
| Full OEM Formats | 5UM-81890-00-00 / 5UM-81890-10-00 / 5UM-81890-11-00 |
| Common Vehicle Type | Dirt Bike / Off-Road Motorcycle |
| 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 Yamaha WR250F off-road motorcycles
- Designed for matching 2003–2014 WR250F electric starting systems
- Replaces common Yamaha starter motor references 5UM-81890-00, 5UM-81890-10, and 5UM-81890-11
- 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 |
| 5UM-81890-00 | Yamaha WR250F starter motor reference |
| 5UM8189000 | Compact format of 5UM-81890-00 |
| 5UM-81890-00-00 | Full Yamaha OEM format |
| 5UM818900000 | Compact format of 5UM-81890-00-00 |
| 5UM-81890-10 | Common Yamaha WR250F starter motor reference |
| 5UM8189010 | Compact format of 5UM-81890-10 |
| 5UM-81890-10-00 | Full Yamaha OEM format |
| 5UM818901000 | Compact format of 5UM-81890-10-00 |
| 5UM-81890-11 | Later / superseding Yamaha WR250F starter motor reference |
| 5UM8189011 | Compact format of 5UM-81890-11 |
| 5UM-81890-11-00 | Full Yamaha OEM format |
| 5UM818901100 | Compact format of 5UM-81890-11-00 |
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 shape, or mounting position, this part may not fit.
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Fitment FAQ
Will this part fit my specific model and year?
This starter motor is designed for select Yamaha WR250F 250cc off-road motorcycle applications from 2003–2014 when the original starter matches the listed 5UM-81890 series OEM references and the 9-tooth CW design. Please compare your original starter motor’s part number, tooth count, rotation direction, body shape, mounting points, and electrical terminal before ordering.
Do I need to match the OEM part number?
Yes, matching the OEM or reference number is strongly recommended. This starter motor replaces Yamaha references 5UM-81890-00, 5UM-81890-10, and 5UM-81890-11, including full OEM formats 5UM-81890-00-00, 5UM-81890-10-00, and 5UM-81890-11-00. However, OEM number alone is not enough. Please also confirm the 9-tooth gear, CW rotation, mounting layout, shaft position, and terminal style.
What models or situations does this part not fit?
This part does not fit Yamaha WR250F, WR250R, WR250X, YZ250F, YZ250FX, YZ250, or other dirt bikes 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.
What should I check before ordering?
Before ordering, please check your motorcycle’s make, model, year, engine version, original starter motor OEM number, tooth count, rotation direction, mounting hole layout, electrical terminal, shaft position, starter body shape, and available installation space. For best fitment, compare the product photos and specifications with your original starter motor before purchase.