Mikuni TMX Carburetor features a radial flat slide design working in a smoothbore venturi that establishes a performance standard for improved throttle response, along with a wider and stronger overall powerband from the engine. These performance gains are provided by the radial flat slide throttle valve design which produces a 40% greater boost signal from the air flowing past it for better throttle response and an increased sensitivity to tuning. Very minimum tuning changes are able to produce noticeable results in engine performance. Recommended use: TMX35 fits 125cc 2-stroke, TMX38 fits 250cc 2-stroke.