This RC-scale 70.0mm center universal bone is intended for the rear side of the center drive on the YZ-4SF chassis. Machined from a lightweight aluminum alloy with a 70-75 hardness rating, the component lowers rotating mass compared with standard steel parts, which can improve throttle feel and reduce load on the drivetrain during use.
Fit this part as a direct replacement for the center universal on the specified chassis; it is dimensioned for the center drive location and designed to install without altering the drivetrain geometry. After fitting, verify clearances, fastener torque, and driveshaft alignment to prevent premature wear elsewhere in the drivetrain.
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