A-B1591302-AI CUP-FLYWHEELOne New Aftermarket Replacement Flywheel Cup Fits Briggs & Fits Stratton Small Engines This flywheel cup (also called a recoil starter cup) mounts between the flywheel and the recoil pull starter assembly on Fits Briggs & Fits Stratton small engines. It engages the starter pawls during pull starting and releases once the engine fires, allowing the recoil to retract freely. A worn or damaged cup is one of the most common causes of a recoil starter that