For carburetor engines, the difficulty of cold start is often due to problems with the throttle system. When you pull up the choke lever, the choke plate inside the carburetor will partially close, reducing the intake air while increasing the fuel intake, forming a richer mixture. This enriched mixture is more flammable and explosive in a cold state, thus achieving instant ignition. After replacing this kit, you will regain this reliable cold start assist function and bid farewell to the embarrassment of repeated ignition.