Yokomo S4-303MSA Slipper Shaft for YZ-4SF  [S4-303MSA]

Direct replacement slipper shaft for YZ-4SF

The S4-303MSA is supplied as a replacement main shaft intended for use in the slipper assembly on YZ-4SF models. It secures the slipper elements while maintaining the designed slip function to protect drivetrain parts under strain.

Compatibility is tied to chassis code B-YZ4SF, so confirm your model code prior to ordering. This listing presents the item as a standard spare part rather than a tuned upgrade, meant to reproduce the original fit and behavior for the YZ-4SF slipper arrangement.

Replacing the shaft usually requires partial disassembly of the slipper unit to remove the original shaft and install the new one, taking care with alignment and engagement of the pads or springs when reassembling. Use this component as a direct swap when restoring factory slipper positioning during maintenance or setup changes.