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Magneto Stator for Yamaha Timberwolf 250 & Bear Tracker | 4BD-85510-20-00
Magneto Stator for Yamaha Timberwolf 250 & Bear Tracker | 4BD-85510-20-00
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Product Overview
Get your ATV back on the trails with this premium magneto stator replacement. Specifically designed for early Yamaha Timberwolf 250 and Bear Tracker 250 models, this unit resolves common electrical failures like weak spark or poor battery charging. Engineered to withstand mud, water, and heat, it ensures your machine starts reliably every time you hit the ignition.
Product Compatibility
| Brand | Model | Sub-Model / Version | Year Range |
| Yamaha | YFB250 Timberwolf | 2WD / 4WD | 1994 - 2000 |
| Yamaha | YFM250 Bear Tracker | Standard | 1999 - 2000 |
| Yamaha | YFM250 Bear Tracker | California Edition | 1999 - 2000 |
| Yamaha | YFB250F Timberwolf | 4WD Edition | 1994 - 2000 |
Specifications
| Feature | Technical Details |
| Outer Diameter (OD) | 93mm (3.66") |
| Inner Diameter (ID) | 34mm (1.34") |
| Core Thickness | 13mm (0.51") |
| OEM Reference | 4BD-85510-20-00 |
| Material | High-purity Copper Winding + Wear-resistant Lamination |
Key Features
- Direct OEM Integration: Precision-engineered as a "drop-in" replacement for part 4BD-85510-20-00, ensuring perfect alignment with factory mounting holes.
- Stable Charging Output: Delivers consistent 12V power to maintain battery health and power your ATV’s headlights and ignition system under heavy loads.
- Heavy-Duty Construction: Built with premium heat-resistant coatings to prevent internal short-circuiting caused by the high thermal cycles of air-cooled engines.
- Plug & Play Ready: Features factory-style connectors and the correct rubber grommets for a quick, watertight swap without wire splicing.
- Engineered for Off-Road: Reinforced windings and vibration-resistant materials provide a significantly longer service life than standard aftermarket units.
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Fitment FAQ
Will this part fit my specific model and year?
This magneto stator is intended for Yamaha; YFB250 Timberwolf; 2WD / 4WD; 1994 - 2000; YFM250 Bear Tracker; Standard. Listed year information includes 1994–2000, 1999–2000, 1994, 2000, 1999. It is best matched to original part number(s) 4BD-85510-20-00. Key physical/spec details from the product data include Outer Diameter (OD): 93mm (3.66"), Inner Diameter (ID): 34mm (1.34"), Core Thickness: 13mm (0.51"). 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 4BD-85510-20-00 before purchase. For this magneto stator, also compare the OEM number, outer/inner diameter, core height or thickness, plug shape, wire count, mounting holes, pickup position, and rubber grommet style. This is especially important for Yamaha Timberwolf/Bear Tracker/YFB250/YFM250 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 magneto stator for machines outside the listed compatibility, or for units with different plug layouts, pickup-coil positions, wire counts, stator diameters, or charging/ignition configurations. If your original part number does not cross-reference with 4BD-85510-20-00, treat the fitment as unconfirmed. Model years outside 1994–2000, 1999–2000, 1994, 2000, 1999 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, outer/inner diameter, core height or thickness, plug shape, wire count, mounting holes, pickup position, and rubber grommet style. Confirm OEM/cross-reference number(s): 4BD-85510-20-00. Recheck listed specs such as Outer Diameter (OD): 93mm (3.66"), Inner Diameter (ID): 34mm (1.34"), Core Thickness: 13mm (0.51"). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.