For 2 Stroke EXC50 EXC300 For TC250 TC300 For EC250 EC300 2020-2023 Carburetor Air Fuel Mixture CNC Screw This carburetor air fuel mixture screw is designed for precise adjustment of the air and fuel ratio in compatible engines.It allows fine tuning to achieve engine performance under various operating conditions.The screw is crafted with CNC machining technology ensuring accurate dimensions and reliable fitment.Suitable for use on specific 2 stroke engine models including EXC series TC series and EC series from certain manufacturers.This part supports improved engine response and efficiency when properly adjusted.It is intended for users who are familiar with carburetor setup and maintenance procedures.Installation requires basic mechanical knowledge and appropriate tools.The screw functions as a key component in the carburetor system enabling control over idle and low speed fuel delivery.Proper adjustment can contribute to smoother engine and better fuel combustion. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.