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1987–1989 Yamaha Moto-4 Big Bear Warrior 350 16-Coil 9-Wire Stator 1YW-85510-21-00
1987–1989 Yamaha Moto-4 Big Bear Warrior 350 16-Coil 9-Wire Stator 1YW-85510-21-00
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Product Overview
Replace a weak, burned, or failed stator with this 16-coil 9-wire magneto stator, designed for select 1987–1989 Yamaha 350cc ATV models, including Moto-4 350, Big Bear 350, Warrior 350, and Terra Pro 350 applications.
The stator is an important part of the ATV charging and ignition system. It helps generate electrical power while the engine is running, supporting the battery, ignition system, lights, and other electrical components. If your Yamaha YFM350 has weak charging, no spark, dim lights, unstable voltage, or stator-related electrical failure, replacing the stator may help restore normal electrical performance.
Made with high-quality copper wire and insulation, this replacement stator is built to deliver stable electrical output and withstand off-road vibration, heat, and demanding riding conditions. Please compare your original stator’s OEM number, wire count, plug layout, outer diameter, inner diameter, and overall shape before ordering.
Product Compatibility
| Make | Model | Year Range | OEM Reference | Fitment Notes |
|---|---|---|---|---|
| Yamaha | Moto-4 350 YFM350ER | 1987–1989 | 1YW-85510-21-00 / 2NL-85510-20-00 / 2XK-85510-20-00 | Main fitment; confirm original stator size and plug layout |
| Yamaha | Big Bear 350 YFM350FW 4WD | 1987–1989 | 1YW-85510-21-00 / 2NL-85510-20-00 / 2XK-85510-20-00 | Fits matching 9-wire stator version only |
| Yamaha | Warrior 350 YFM350X | 1987–1989 | 1YW-85510-21-00 / 2NL-85510-20-00 / 2XK-85510-20-00 | Compare OEM number, wire count, and connector before purchase |
| Yamaha | Terra Pro 350 YFP350U | 1988 | 1YW-85510-21-00 / 2NL-85510-20-00 / 2XK-85510-20-00 | Possible fitment if original stator and connector match |
| Yamaha | YFM350 350cc ATV Models | 1987–1989 | 1YW-85510-21-00 / 2NL-85510-20-00 / 2XK-85510-20-00 | Fitment must be confirmed by OEM number, size, and wiring |
Important Fitment Note:
This part is not selected by engine size alone. Yamaha YFM350 ATV models may use different stator versions depending on year, submodel, market, and wiring system. Please confirm your original stator matches the OEM reference, 16-coil / 9-wire layout, connector style, and dimensions listed below.
Specifications
| Specification | Details |
| Product Type | Magneto Stator / Generator Coil |
| Coil Count | 16 Coils |
| Wire Count | 9 Wire |
| Outer Diameter | 115mm / 4.53" |
| Inner Diameter | 54mm / 2.13" |
| Iron Core Height | 16mm / 0.63" |
| OEM Reference | 1YW-85510-21-00 / 2NL-85510-20-00 / 2XK-85510-20-00 |
| Material | Copper Wire + Insulated Stator Core |
| Application | ATV Charging / Ignition System |
| Compatible Brand | Yamaha |
| Package Includes | 1 x Magneto Stator Coil, 1 x Keychain |
Key Features
- Designed for select 1987–1989 Yamaha 350cc ATV models
- Fits Yamaha Moto-4 350 YFM350ER, Big Bear 350 YFM350FW, Warrior 350 YFM350X, and Terra Pro 350 applications
- Replaces OEM reference numbers 1YW-85510-21-00, 2NL-85510-20-00, and 2XK-85510-20-00
- 16-coil 9-wire stator helps support charging and ignition system output
- Helps address weak charging, no spark, dim lights, unstable voltage, or stator failure
- Copper winding supports stable conductivity and heat resistance
- Built to withstand off-road vibration and high-temperature ATV operating conditions
OEM Cross Reference
| OEM / Reference Number | Notes |
| 1YW-85510-21-00 | Common OEM reference for 1987–1989 Yamaha YFM350 stator applications |
| 2NL-85510-20-00 | Common replacement reference for compatible Yamaha 350cc ATV stators |
| 2XK-85510-20-00 | Common replacement reference for Yamaha Warrior / Moto-4 / Big Bear 350 stator applications |
Please use the OEM number together with physical dimensions and connector layout for fitment confirmation. If your original stator has a different wire count, plug quantity, outer diameter, inner diameter, iron core height, or overall shape, this part may not fit.
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Fitment FAQ
Will this part fit my specific model and year?
This stator is designed for select 1987–1989 Yamaha 350cc ATV models, including Moto-4 350 YFM350ER, Big Bear 350 YFM350FW, Warrior 350 YFM350X, and select Terra Pro 350 YFP350 applications. Please compare your original stator’s OEM number, wire count, plug layout, outer diameter, inner diameter, iron core height, and overall shape before ordering.
Do I need to match the OEM part number?
Yes, matching the OEM part number is strongly recommended. This stator replaces 1YW-85510-21-00, 2NL-85510-20-00, and 2XK-85510-20-00. However, OEM number alone is not enough. Please also confirm the 16-coil 9-wire layout, connector style, outer diameter, inner diameter, iron core height, and wire harness layout.
What models or situations does this part not fit?
This part does not fit Yamaha YFM350 models that use a different stator diameter, different wire count, different plug layout, different OEM number, or different charging system design. It is also not suitable if your issue is caused only by a bad regulator rectifier, weak battery, faulty CDI, damaged ignition coil, burned wiring, or poor ground connection.
What should I check before ordering?
Before ordering, please check your ATV’s make, model, year, submodel, OEM part number, original stator coil count, wire count, plug quantity, connector shape, outer diameter, inner diameter, iron core height, wire harness length, and overall shape. For best fitment, compare the product photos and specifications with your original stator before purchase.