Model Compatibility: Fits NSR125F, NSR125R, FXD125, and CG125 motorcycle models with 125cc engine displacement and 12V electrical system. Electrical Specification: Provides voltage regulation and AC-to-DC rectification for 12V motorcycle electrical systems as specified in the. Functional Purpose: Restores voltage regulation and rectification function when replacing a failed or degraded unit on compatible 125cc motorcycles. Application Scope: Designed for use on NSR, FXD, and CG series 125cc motorcycles requiring a 12V regulator rectifier component. Installation Requirement: Direct-fit replacement requiring no modification to wiring harness or mounting configuration of the regulator rectifier unit.