Flat Slide TM Series Carburetor. This FLAT SLIDE SMOOTHBORE design cuts down the turbulence in the bore-throat to increase air flow efficiency. Smoothbore design eliminates various orifices and obstacles in the carb throat which cuts down the turbulence to increase air flow efficiency. Uses standard VM pilot, main and air jets. Comes with built-in location for power jet.We are here to assure you that we will always immediately address any concerns you may have.