This hydraulic clutch master cylinder repair kit includes an upper pump made from CNC-machined aluminum, designed to restore clutch system functionality.The component features a polished and galvanized protective finish for enhanced and a clean appearance.It measures 235mm in length with a 22mm (7/8 inch) handlebar clamp diameter, fitting standard handlebar configurations on compatible motorcycles.The kit supports integration with both standard and aftermarket hydraulic clutch systems.It includes an adjustable reach lever for customized positioning based on rider preference.A 10mm x 1.25 pitch (clockwise) threaded hole is provided for mirror mounting, and the oil-out screw features a 10mm x 1.0 pitch (clockwise) thread for hydraulic system bleeding and maintenance.This part is also referred to as an oil pressure separation upper pump or rear brake oil cylinder separation pump and is intended for repair or upgrade use in compatible systems.