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Kymco MXU Mongoose 250 300 Starter Motor 2003–2014 | 31210-LBA7-900
Kymco MXU Mongoose 250 300 Starter Motor 2003–2014 | 31210-LBA7-900
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Product Overview
Restore reliable electric starting performance to your Kymco ATV with this 12V 9-tooth starter motor.
Designed to replace Kymco OEM 31210-LBA7-900 and 31210-LBA7-90B, this starter motor helps deliver dependable cranking power for compatible Kymco MXU, Mongoose, Maxxer, and KXR 250 / 300 ATV models.
It is a practical replacement for common starter-related issues such as slow cranking, no-start problems, intermittent starter engagement, worn internal brushes, or a failed original starter motor.
Product Compatibility
| Brand | Model | Sub-Model / Notes | Year Range | OEM Reference |
|---|---|---|---|---|
| Kymco | Mongoose 250 | ATV model | 2003–2009 | 31210-LBA7-900, 31210-LBA7-90B |
| Kymco | Mongoose 300 | ATV model | 2005–2014 | 31210-LBA7-900, 31210-LBA7-90B |
| Kymco | MXU 250 | ATV model | 2004–2009 | 31210-LBA7-900, 31210-LBA7-90B |
| Kymco | MXU 300 | ATV model | 2005–2009 | 31210-LBA7-900, 31210-LBA7-90B |
| Kymco | Maxxer 250 | ATV model | 2004–2009 | 31210-LBA7-900, 31210-LBA7-90B |
| Kymco | Maxxer 300 | ATV model | 2005–2009 | 31210-LBA7-900, 31210-LBA7-90B |
| Kymco | KXR 250 | Select ATV applications | 2006–2015 | 31210-LBA7-900, 31210-LBA7-90B |
OEM Cross Reference
| OEM / Interchange Number | Brand / Reference | Notes |
|---|---|---|
| 31210-LBA7-900 | Kymco | Main starter motor replacement number |
| 31210-LBA7-90B | Kymco | Interchange / related starter motor number |
| 31210LBA7900 | Kymco format | Same number without dashes |
| 31210LBA790B | Kymco format | Same number without dashes |
| 1781120 | Aftermarket reference | Use as secondary interchange number only |
| 3304-274 | Aftermarket / cross reference | Commonly listed interchange number |
| S31200-RB1-000 | Aftermarket / cross reference | Commonly listed interchange number |
Specifications
| Specification | Details |
|---|---|
| Product Type | Electric Starter Motor |
| Voltage | 12V |
| Gear Teeth | 9 Teeth |
| Rotation | Clockwise / CW |
| Replacement OEM Numbers | 31210-LBA7-900, 31210-LBA7-90B |
| Installation Hole Distance | 39 mm |
| Overall Length | 180 mm |
| Application | Kymco 250cc / 300cc ATV starting system |
| Installation | Direct replacement when dimensions and OEM number match |
Key Features
- Replaces Kymco starter motor numbers 31210-LBA7-900 and 31210-LBA7-90B
- 12V 9-tooth starter motor with clockwise rotation
- Designed for compatible Kymco MXU, Mongoose, Maxxer, and KXR 250 / 300 ATV models
- Helps restore reliable cranking and electric starting performance
- Practical replacement for a weak, worn, or failed original starter motor
- Built for ATV starting-system repair and everyday riding use
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Fitment FAQ
Will this part fit my specific model and year?
This starter motor is intended for OEM Reference; Kymco; Mongoose 250; ATV model; 2003–2009; 31210-LBA7-900, 31210-LBA7-90B. It is best matched to original part number(s) 31210-LBA7-900, 31210-LBA7-90B, 3304-274, S31200-RB1-000. Key physical/spec details from the product data include Restore reliable electric starting performance to your Kymco ATV with this 12V 9-tooth starter motor., Voltage: 12V, Gear Teeth: 9 Teeth. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 31210-LBA7-900, 31210-LBA7-90B, 3304-274, S31200-RB1-000 before purchase. For this starter motor, also compare the OEM number, voltage, tooth count, rotation direction, mounting ears, bolt spacing, terminal type, and overall length. This is especially important for Kymco models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this starter motor for machines outside the listed compatibility, or for units with different tooth counts, CW/CCW rotation, mounting ears, terminal locations, or voltage ratings. If your original part number does not cross-reference with 31210-LBA7-900, 31210-LBA7-90B, 3304-274, S31200-RB1-000, treat the fitment as unconfirmed. Model years outside 2003–2014, 2003–2009, 2005–2014, 2004–2009, 2005–2009 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, voltage, tooth count, rotation direction, mounting ears, bolt spacing, terminal type, and overall length. Confirm OEM/cross-reference number(s): 31210-LBA7-900, 31210-LBA7-90B, 3304-274, S31200-RB1-000. Recheck listed specs such as Restore reliable electric starting performance to your Kymco ATV with this 12V 9-tooth starter motor., Voltage: 12V, Gear Teeth: 9 Teeth. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.