This component is an aluminum center pulley frange produced to install inside the center pulley of the YZ-4 chassis. It is supplied as 1 pcs and serves as a direct replacement piece for the center pulley assembly on YZ-4 RC models.
In use, the frange locates the inner face of the center pulley and assists in preserving axial alignment of the center drive. When overhauling the center pulley assembly you can swap the inner frange to restore correct spacing or to ensure a uniform contact surface where the pulley contacts the shaft.
Fitting involves disassembling the center pulley assembly to remove the original inner flange, fitting this aluminum frange, then reassembling the pulley. After reassembly, check center drive alignment and axial clearance before operating the model.
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