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9-Tooth Starter Motor for Yamaha WR450F 2007–2014 5TJ-81890-30
9-Tooth Starter Motor for Yamaha WR450F 2007–2014 5TJ-81890-30
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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 WR450F 450cc off-road motorcycle applications from 2007–2014.
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 12V system, brush-type carbon design, 9-tooth gear, clockwise rotation, and gear-reduction construction 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 | WR450F | 2007–2014 | 5TJ-81890-30 / 5TJ-81890-31 | Main fitment; confirm original starter gear and body shape |
| Yamaha | WR450F 450cc Off-Road Motorcycle | 2007–2014 | 5TJ-81890-30-00 / 5TJ-81890-31-00 | Match by OEM number, tooth count, and rotation |
| Yamaha | WR450F | 2003–2006 | Different 5TJ starter version commonly used | Not recommended unless the original starter fully matches |
| Yamaha | WR450F | 2015+ | Different starter version may be used | Verify carefully before purchase |
Important Fitment Note:
This part is not selected by model name alone. Yamaha WR450F models may use different starter motor versions depending on year, market, engine version, gear count, rotation direction, mounting points, starter cable position, and electrical terminal style. Please confirm your original starter motor matches the listed OEM/reference number, 9-tooth gear, clockwise rotation, and overall shape before ordering.
Specifications
| Specification | Details |
| Product Type | Electric Starter Motor |
| Compatible Brand | Yamaha |
| Main Compatible Model | WR450F |
| Main Compatible Year Range | 2007–2014 |
| Engine Platform | 450cc 4-Stroke Off-Road Motorcycle |
| Voltage | 12V |
| Tooth Count | 9 Teeth |
| Rotation Direction | Clockwise / CW |
| Brush Type | Carbon Brush |
| Torque | 1.1 Nm, based on supplied product data |
| Cycle Rating | 10000, based on supplied product data |
| Main OEM Reference | 5TJ-81890-30 |
| Full OEM Format | 5TJ-81890-30-00 |
| Superseding / Related Reference | 5TJ-81890-31 / 5TJ-81890-31-00 |
| Common Vehicle Type | Dirt Bike / Enduro / 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 WR450F off-road motorcycles
- Designed for matching 2007–2014 WR450F electric starting systems
- Replaces Yamaha starter motor reference 5TJ-81890-30 / 5TJ-81890-30-00
- Cross-references with later 5TJ-81890-31 / 5TJ-81890-31-00 listings
- 12V clockwise starter motor design for matching WR450F applications
- Gear-reduction construction helps crank the larger 450cc engine more effectively
- Helps restore electric start function when the original starter motor is weak, worn, noisy, or failed
- 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 |
| 5TJ-81890-30 | Main Yamaha WR450F 2007–2014 starter motor reference |
| 5TJ8189030 | Compact format of 5TJ-81890-30 |
| 5TJ-81890-30-00 | Full Yamaha OEM format |
| 5TJ818903000 | Compact format of 5TJ-81890-30-00 |
| 5TJ-81890-31 | Later / superseding Yamaha WR450F starter motor reference |
| 5TJ8189031 | Compact format of 5TJ-81890-31 |
| 5TJ-81890-31-00 | Full Yamaha OEM format |
| 5TJ818903100 | Compact format of 5TJ-81890-31-00 |
| SMU0410 | Common aftermarket starter motor reference on some listings; verify before purchase |
| 410-54171 | Common aftermarket starter motor reference on some listings; verify before purchase |
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 WR450F 450cc off-road motorcycle applications from 2007–2014 when the original starter matches the listed 5TJ-81890-30 / 5TJ-81890-31 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 5TJ-81890-30 and full OEM format 5TJ-81890-30-00. It may also cross-reference with 5TJ-81890-31 and 5TJ-81890-31-00. However, OEM number alone is not enough. Please also confirm the 9-tooth gear, clockwise rotation, mounting layout, shaft position, and terminal style.
What models or situations does this part not fit?
This part does not fit Yamaha WR450F 2003–2006 models unless the original starter fully matches this 2007–2014 version. It also does not fit WR250F, WR250R, WR250X, YZ450F, YZ250F, YZ250FX, or other dirt bikes that use a different starter gear count, different rotation direction, different mounting holes, different terminal style, or different starter body.
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.