This Yokomo S4-010B63A centre bone is a 63.5mm RC replacement link intended for YZ-4S chassis. It functions as a direct centre drivetrain component to re-establish linkage geometry without changing other driveline elements.
The product is supplied as a single unit, listed as 1 pcs. It is suitable for direct replacement when the original centre link is due for swapping during maintenance or chassis tuning preparation.
Fitment guidance: the bone is produced to mate with the existing mounting points on compatible YZ-4S assemblies; check alignment and secure fixings when installing. Replacing this link maintains consistent drivetrain geometry and baseline settings, rather than acting as an upgrade.
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