This Yokomo YOKSD414KB king pin ball stud is offered as a replacement part for MR-4TC SD and BD chassis configurations. It operates as the ball-end for front king pin connections and is intended as an aftermarket swap when the factory stud is worn or when changing linkage geometry.
Before fitting, verify that thread pitch, shank length, and ball size match your existing hardware to ensure proper seating in the hub. Remove the hub or retaining fastener, install the new stud, and check steering articulation for smooth, unrestricted movement.
If any fit differences appear between SD and BD hub variants, adjust spacers or retaining washers as required to maintain correct alignment. Regular checks for wear and occasional lubrication will keep steering performance consistent.
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