The spring for lifting the engine on the Solex, also known as the lifting spring, is an essential component of the moped. It is attached to the frame and connected to the engine to keep it in the desired position. The spring stretches when the engine is lowered and pushes it back up as soon as the rider wants to lift the engine to stop or shift into neutral. Its main function is to position the engine correctly and exert the necessary pressure on the tire so that the roller drive functions properly. In case of wear, the spring can lose its tension, leading to problems lifting the engine or insufficient drive.