This Yokomo S4-010B63A centre bone is a 63.5mm replacement link made for the YZ-4S platform. It is supplied as an optional centre drivetrain component to repair or re-establish the centre linkage geometry without modifying other driveline parts.
The package details a single unit, listed as 1 pcs. The part is intended for straightforward replacement when the original centre link needs swapping during routine checks or setup sessions.
Installation advice: the bone is shaped to match the existing mounting points on compatible YZ-4S assemblies; ensure correct alignment and secure fasteners during fitment. Replacing the centre bone preserves baseline drivetrain alignment rather than acting as a performance upgrade.
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