This stator coil is compatible with TRX400 Sportrax, 400 EX, and 400 EX X models and corresponds to OEM part numbers 31120-HN1-A41, 31120-HN1-003, 31120-HN1-000, and 31120-HN1-A40.It is a direct-fit replacement designed to restore consistent electrical output for the ignition and systems.The unit features construction with copper windings and resistance to heat and vibration, supporting stable performance in off-road and recreational riding conditions.Installation requires standard tools and is suitable for experienced users or service technicians.This replacement helps maintain engine starts, electrical stability, and proper of lights and accessories.