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1987–1995 Honda CB400F CB-1 CBR400RR 18-Coil 3-Wire Stator 31120-KAF-003
1987–1995 Honda CB400F CB-1 CBR400RR 18-Coil 3-Wire Stator 31120-KAF-003
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Product Overview
Replace a weak, burned, or failed stator with this 18-coil 3-wire magneto stator, designed for select Honda CB400F / CB-1 and CBR400RR motorcycles using OEM reference numbers 31120-KAF-003, 31120-KY2-003, and 31120-MV4-000.
The stator is an important part of the motorcycle charging system. It helps generate electrical power while the engine is running, supporting the battery, lights, ignition system, and other electrical components. If your Honda CB400F, CB-1, or CBR400RR has weak charging, dim lights, unstable voltage, repeated battery drain, or stator-related electrical failure, replacing the stator may help restore normal charging performance.
Built with a metal lamination core and copper windings, this replacement stator is designed for stable conductivity, heat resistance, and long service life. Please compare your original stator’s OEM number, wire count, plug layout, mounting hole distance, and dimensions before ordering.
Product Compatibility
| Make | Model | Year Range | OEM Reference | Fitment Notes |
|---|---|---|---|---|
| Honda | CB400 / CB400F / CB-1 | 1989–1991 | 31120-KAF-003 / 31120-KY2-003 / 31120-MV4-000 | Main fitment; confirm original stator size and plug layout |
| Honda | CB-1 NC27 | 1989–1991 | 31120-KAF-003 | Common CB-1 fitment; compare OEM number and connector |
| Honda | CBR400 / CBR400RR NC23 | 1987–1989 | 31120-KY2-003 / 31120-MV4-000 | Fits matching 18-coil 3-wire stator version only |
| Honda | CBR400 / CBR400RR NC29 | 1990–1995 | 31120-KY2-003 / 31120-MV4-000 | Confirm wire count, plug style, and mounting holes |
| Honda | CBR 400 RR | 1987–1995 | 31120-KY2-003 / 31120-MV4-000 | Model-name variation; verify exact NC23 or NC29 application |
Important Fitment Note:
This part is not selected by engine size or model name alone. Honda CB400 and CBR400 models may use different charging system parts depending on year, market, model code, and wiring system. Please confirm your original stator matches the OEM reference, 18-coil / 3-wire layout, DC type, connector style, 35mm inner diameter, 92mm outer diameter, and 38mm mounting hole distance before ordering.
Specifications
| Specification | Details |
| Product Type | Magneto Stator / Generator Coil |
| Coil Count | 18 Coils / 18 Poles |
| Wire Count | 3 Wire |
| Electrical Type | DC |
| Inner Diameter | 35mm / 1.4" |
| Outer Diameter | 92mm / 3.6" |
| Iron Core Height | 21mm / 0.83" |
| Mounting Hole Distance | 38mm / 1.5" |
| Thickness | 32mm / 1.3" |
| OEM Reference | 31120-KAF-003 / 31120-KY2-003 / 31120-MV4-000 |
| Material | Metal Lamination Core + Copper Winding |
| Application | Motorcycle Charging System |
| Compatible Brand | Honda |
Key Features
- Designed for select Honda CB400F, CB-1, CBR400, and CBR400RR motorcycles
- Fits CB-1 / CB400F 1989–1991, CBR400RR NC23 1987–1989, and CBR400RR NC29 1990–1995
- Replaces common OEM references 31120-KAF-003, 31120-KY2-003, and 31120-MV4-000
- 18-coil 3-wire stator helps support stable charging system output
- Helps address weak charging, dim lights, unstable voltage, battery drain, or stator failure
- Copper winding supports stable conductivity and improved heat resistance
- Direct replacement style, but original OEM number, plug layout, and dimensions must be checked before installation
OEM Cross Reference
| OEM / Reference Number | Notes |
| 31120-KAF-003 | Common reference for Honda CB400F / CB-1 stator applications |
| 31120-KY2-003 | Common reference for Honda CBR400 / CBR400RR stator applications |
| 31120-MV4-000 | Common reference for Honda CBR400RR NC23 / NC29 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, outer diameter, inner diameter, mounting hole spacing, thickness, or plug style, 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 Honda CB400 / CB400F / CB-1 models from 1989–1991, Honda CBR400RR NC23 models from 1987–1989, and Honda CBR400RR NC29 models from 1990–1995 using OEM reference numbers 31120-KAF-003, 31120-KY2-003, or 31120-MV4-000. Please compare your original stator’s OEM number, wire count, plug layout, inner diameter, outer diameter, mounting hole distance, and thickness before ordering.
Do I need to match the OEM part number?
Yes, matching the OEM part number is strongly recommended. This stator replaces 31120-KAF-003, 31120-KY2-003, and 31120-MV4-000. However, OEM number alone is not enough. Please also confirm the 18-coil 3-wire layout, DC electrical type, plug style, inner diameter, outer diameter, mounting hole distance, and stator thickness.
What models or situations does this part not fit?
This part does not fit Honda CB400, CB-1, CBR400, CBR400RR, or other Honda models that use a different stator diameter, different wire count, different connector layout, different mounting hole spacing, or a different OEM charging system design. It is also not a replacement for the regulator rectifier, battery, CDI, ignition coil, flywheel, or complete wiring harness.
What should I check before ordering?
Before ordering, please check your motorcycle’s make, model, year, model code, OEM part number, original stator coil count, wire count, connector shape, inner diameter, outer diameter, mounting hole distance, stator thickness, and overall shape. For best fitment, compare the product photos and specifications with your original stator before purchase.