Compatible with motorcycle models carburetor idle adjuster screw kit for 21 34MM idle speed screw.This kit is designed to regulate the engine idle speed on compatible carbureted motorcycles.The idle adjuster screw allows fine tuning of the throttle stop position to maintain consistent idle performance.Constructed for durability and precise adjustment, the screw fits carburetors within the specified size range.Installation is straightforward, replacing the existing idle screw to help optimize engine at low RPM.The kit includes all necessary components for setup and is intended for use in carburetor maintenance and tuning applications. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.