Yokomo S4-203AA Aluminum Servo Mount for YZ-4S Chassis  [S4-203AA]

Aluminum servo mount for YZ-4S

The Yokomo S4-203AA is an aluminum internal servo mount intended for use on YZ-4S scale touring car chassis. It is manufactured as an inside-chassis post that locates the servo body for a rigid connection to the steering system. The part is intended to be paired with the corresponding outside mount post and a graphite servo mount plate designed for the YZ-4S chassis to complete the assembly.

Installation notes: this mount installs inside the chassis and secures the servo via the internal post interface, so the external post and graphite plate must be used to clamp the servo in place. Check alignment of the servo spline and horn before final tightening, and verify that the mount clears adjacent components within the chassis to avoid binding.

Tuning role: using a machined aluminum internal mount reduces unwanted flex between the servo and the steering linkage, which helps maintain consistent steering input. Small adjustments such as plate thickness or shimming at the mating surfaces can be used to fine-tune servo height and roll centre without changing chassis geometry.

Compatibility

Designed for YZ-4S style touring chassis and listed as compatible with B-YZ4SF mounting layouts; verify your chassis mounting pattern matches before fitting.

Choose this mount when you need a compact, rigid internal servo mounting solution for YZ-4S chassis builds, and pair it with the recommended external post and graphite plate for a complete installation.