This carburetor is used for repair and routine maintenance of Small engine equipment. It is intended to replace worn, clogged, or unstable carburetor assemblies and help restore normal starting, idling, and fuel delivery. Please confirm the compatible model list (HRR216K10, HRR216K11, HRR216K9, HRS216K5, HRS216K6, HRS21), replacement numbers (16100-Z8B-901, HRR216K10, HRR216K11, HRR216K9, HRS216K5, HRS216K6), and key fit details such as choke/linkage style, fuel inlet direction, mounting holes, and included parts before purchase and installation. Brand and model references are used only for compatibility identification.