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

Machined internal servo mount for YZ-4S

The Yokomo S4-203AA serves as an aluminum internal servo post for use on YZ-4S style touring car chassis. Crafted as an inside-chassis mounting post, it fixes the servo body to create a durable connection to the steering system. To complete the full mounting arrangement, pair this internal post with the corresponding outside mount post and a graphite servo mount plate designed for the YZ-4S.

Fitting notes: install this component inside the chassis and secure the servo using the internal post; the external post plus graphite plate are required to clamp the servo effectively. Double-check servo spline position and horn fitment prior to final tightening, and confirm there is adequate clearance to avoid interference with nearby components.

Durability benefits: using a machined aluminum internal mount reduces unwanted movement between servo and linkage, which helps keep steering input consistent. Adjustments such as plate selection or shimming at the joint faces are useful for dialing servo height and roll centre while preserving the chassis geometry.

Fitment details

Made for YZ-4S style touring chassis and specified as compatible with B-YZ4SF mounting patterns; make sure your chassis pattern matches before fitting.

Opt for this mount when you want a compact, resilient internal servo mounting solution for YZ-4S chassis projects, and use the recommended external post and graphite plate to finish the installation.