This is a brand new aftermarket stator for the Yamaha YFM 225 and YFM 250 Moto-4 built between 1986 and 1991, supplied as RMSTATOR part RM01298B. It is a direct replacement for your original unit, fits the factory mounting points and connects through the supplied plugs, so no cutting or splicing is required.
Seven wires run out through two plugs, covering the alternator winding, the pick-up pulsar coil and the second pick-up circuit. The windings are the highest grade copper on the highest grade lamination materials, rated to resist 200 degrees Celsius. The pick-up pulsar coil, the connector, the rubber grommet and the opposite connector for the main harness side are all supplied with the unit, which matters on a machine of this age where the harness half of the joint is usually as tired as the stator itself.
Key Features
- Brand new aftermarket stator
- Direct replacement for the original unit
- Plug-and-play, direct fit, easy installation
- Highest grade lamination materials
- Highest grade copper windings, resistant to 200 degrees Celsius
- Pick-up pulsar coil included
- Connector and opposite connector (main harness side) included
- Rubber grommet included
Technical Specs
| Specification |
Detail |
| Interior diameter |
35 mm |
| Exterior diameter |
93 mm |
| Thickness |
16 mm |
| Length of wires, stator to grommet |
83 mm |
| Length of wires, grommet to plug |
300 mm |
| Length of pick-up coil wire to grommet |
155 mm |
| Number of wires |
7 |
| Number of plugs |
2 |
| Number of pins |
7 |
| Alternator resistance, yellow to yellow |
0.4 ohms plus or minus 20% |
| Pick-up resistance, green to blue |
200 ohms plus or minus 20% |
| Pick-up 2 resistance, red to white |
340 ohms plus or minus 20% |
| Copper winding temperature rating |
200 degrees Celsius |
| Part number |
RM01298B |
Vehicle Fitment Guide
| Make & Model |
Years |
| Yamaha YFM 225 Moto-4 |
1986-1991 |
| Yamaha YFM 250 Moto-4 |
1986-1991 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 59V-85510-20-00 |
Yamaha |
Frequently Asked Questions
Does this stator fit without modification?
Yes. It is a direct replacement for the original unit on the 1986-1991 YFM 225 and YFM 250 Moto-4, using the factory mounting points and the supplied connectors, so no cutting, splicing or drilling is needed.
What is included?
The stator, the pick-up pulsar coil, the connector, the opposite connector for the main harness side, and the rubber grommet.
How can I tell my old stator has failed?
Measure it cold with a multimeter. Expect 0.4 ohms plus or minus 20% yellow to yellow, 200 ohms plus or minus 20% green to blue, and 340 ohms plus or minus 20% red to white. Readings far outside those figures, or any winding showing continuity to the stator body, mean the unit has failed.
Does one stator cover both the 225 and the 250 Moto-4?
Yes. RM01298B is listed for the YFM 225 and the YFM 250 Moto-4 across 1986 to 1991, and it cross references to Yamaha 59V-85510-20-00.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
