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The throttle return springs keep the tension between the throttle linkage and the carburetor throttle shaft to help the butterfly close when off throttle. This prevents the carburetor from going wide open it the throttle assembly fails. It's important to have a secondary return spring which the governor spring can do in cases the primary throttle return spring fails.
The Throttle Return Spring fits most of the 196cc 6.5hp Clone Throttle Assemblies including Honda GX200, Ducar 196, Ducar/Tillotson 212E, Tillotson 196R/RS, Tillotson 212R, Ducar/Tillotson 212E, Tillotson 225RS, Predator 212 and BSP 196 and 212 Engines.