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Check your needle settings on your carburetor; most tuning shouldn't have the needle more than 2.5 turns out. If you are running your needle out further than this, there may not be enough tension on the needle to keep it from backing out.
The Idle Adjustment Screw Spring fits most of the 196cc 6.5hp Clone Stock Carburetors, 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.