A recoil pull-start assembly is the engine's starting mechanism. The machine operator pulls on the rope, which activates the pulley system to start the machine's engine. This part is a recoil pull-start assembly kit contains a rope, a pulley, and an innerspring, which are all of the components of the pull start assembly. A pull-start assembly kit may be needed if the recoil or pulley system has broken due to use over time. The rope may become broken or frayed and the plastic on the pulley could crack. While the rope itself is available separately, it's a good idea just to replace the entire pull start assembly kit while in the process of replacing any of the components to ensure even wear. This genuine OEM MTD part is sourced directly from the manufacturer. It is sold individually. It is used on blowers, vacuums, and trimmers that are manufactured by Craftsman, Bolens, MTD, and Troy-Bilt.