A-B1590676-AI CUP-GOVERNOROne New Aftermarket Replacement Governor Cup Fits Briggs and Stratton Small Engines This governor cup is a key component of the mechanical centrifugal governor system found inside Fits Briggs and Stratton small engines. The cup works in conjunction with the governor gear's flyweights to translate rotational centrifugal force into throttle movement, maintaining consistent engine speed under varying load conditions and preventing engine runaway.