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

Compact aluminium servo post for YZ-4S applications

The Yokomo S4-203AA functions as an aluminium internal servo mount for YZ-4S scale touring car chassis. Made as an inside-chassis post, it locates the servo body to form a rigid connection to the steering system. To assemble the complete mounting, this internal post must be paired with the corresponding outside mount post and a graphite servo mount plate designed for the YZ-4S chassis.

Fitting advice: the mount installs inside the chassis and secures the servo through the internal post; the external post and graphite plate are necessary to clamp the servo in place. Always confirm the servo spline and horn alignment before final tightening and check for any clearance issues with nearby components to avoid binding.

Setup benefits: using a machined aluminium internal mount cuts unwanted flex between the servo and steering linkage, supporting steadier steering input. Fine adjustments like changing plate thickness or adding shims at the mating faces allow precise control of servo height and roll centre while leaving chassis geometry intact.

Mounting compatibility notes

Intended for YZ-4S style touring chassis and indicated as compatible with B-YZ4SF mounting patterns; verify your chassis mounting pattern prior to fitting.

Use this mount when you require a neat, rigid internal servo mounting option for YZ-4S chassis projects, and pair it with the recommended external post and graphite plate to complete the assembly.