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Honda VFR400 RVF400 18 Coil Magneto Stator | 31120-MR8-781
Honda VFR400 RVF400 18 Coil Magneto Stator | 31120-MR8-781
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Product Overview
Restore reliable charging and ignition performance with this 18 coil magneto stator, designed for selected Honda VFR400 and RVF400 motorcycle applications.
Built to replace 31120-MR8-781, this stator helps solve common electrical issues such as battery not charging, weak or no spark, hard starting, unstable voltage, and intermittent charging failure.
Made with copper windings, copper-clad steel wire, and a durable aluminum base plate, this magneto stator is designed to provide stable electrical output, reliable charging performance, and long service life under sportbike riding conditions.
Product Compatibility
| Brand | Model | Engine / HP / CC | Year Range | Notes |
|---|---|---|---|---|
| Honda | VFR400 NC21 | 400cc | 1985–1987 | Verify OEM number, connector style, and stator dimensions before purchase |
| Honda | VFR400 NC24 | 400cc | 1987–1988 | Verify OEM number, connector style, and stator dimensions before purchase |
| Honda | VFR400R NC30 | 400cc | 1989–1992 | Verify OEM number, connector style, and stator dimensions before purchase |
| Honda | RVF400 NC35 | 400cc | 1994–1996 | Verify OEM number, connector style, and stator dimensions before purchase |
OEM Cross Reference:
31120-MR8-781
Related references sometimes seen:
31100-MR8-003, 31100-MR8-781
Specifications
| Specification | Details |
|---|---|
| Part Type | Magneto Stator Coil |
| Configuration | 18 Coil |
| Outer Diameter | 103 mm |
| Inner Diameter | 42 mm |
| Thickness | 15 mm |
| Material | Copper coil / Copper-clad steel wire / Aluminum plate |
| Function | Charging and ignition system support |
| Installation | Direct replacement on correctly matched applications |
| Fitment Method | Match by OEM number, connector style, stator size, and original part layout |
| Condition | 100% New Aftermarket |
Key Features
- 18 Coil Stator Design – Helps provide stable electrical output for the charging system
- OEM-Style Replacement – Designed to replace Honda stator reference 31120-MR8-781
- Reliable Charging Performance – Helps restore battery charging and electrical-system stability
- Durable Construction – Built with copper windings and an aluminum base plate for long service life
- Stable Ignition Support – Helps improve spark stability, starting reliability, and throttle response
- Direct Replacement Style – Designed for straightforward installation when connector and dimensions match
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Fitment FAQ
Will this part fit my specific model and year?
This magneto stator is intended for Engine / HP / CC. Listed year information includes 1985–1987, 1987–1988, 1989–1992, 1994–1996, 1985. It is best matched to original part number(s) 31120-MR8-781, 31100-MR8-003, 31100-MR8-781. Key physical/spec details from the product data include Outer Diameter: 103 mm, Inner Diameter: 42 mm, Thickness: 15 mm. 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 31120-MR8-781, 31100-MR8-003, 31100-MR8-781 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 Honda VFR400/RVF400 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 31120-MR8-781, 31100-MR8-003, 31100-MR8-781, treat the fitment as unconfirmed. Model years outside 1985–1987, 1987–1988, 1989–1992, 1994–1996, 1985 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): 31120-MR8-781, 31100-MR8-003, 31100-MR8-781. Recheck listed specs such as Outer Diameter: 103 mm, Inner Diameter: 42 mm, Thickness: 15 mm. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.