WIDE COMPATIBILITY: This carburetor is designed for Stihl FS38, FS45, FS46, FS55 2-mix series lawnmowers and is perfectly compatible with model 4140 120 0623. EFFICIENT FUEL MIXING: By using advanced fuel mixing technology, this carburetor can precisely control the mixing ratio of fuel and air to ensure efficient fuel combustion. Excellent performance improvement: The performance of Stihl FS38, FS45, FS46, FS55 2-mix lawnmowers will be significantly improved after adapting this carburetor. Whether it's starting speed, cutting efficiency, or overall operational stability, the machines will demonstrate excellent performance, helping users easily cope with a wide range of cutting tasks. Convenient installation and maintenance: The carburetor has been designed with user-friendliness in mind, and the installation process is simple and intuitive. This makes maintenance and operation of the lawnmower easier and improves work efficiency. DURABLE: Made of high-quality materials, this carburetor has durability and excellent stability. It maintains stable performance even under harsh working conditions, reducing the risk of failures and damage. Users can count on long-lasting, reliable operation without frequent replacements or repairs.