YZ-4S Servo Mount Plate S4-203PA - Graphite upgrade for YZ-4S and B-YZ4SF  [S4-203PA]

Servo mount plate for tuning steering response

The graphite servo mount plate is designed for use on YZ-4S and compatible B-YZ4SF chassis. It provides a precise, low-mass mounting point that helps keep the servo stable relative to the chassis centreline and steering linkages for predictable responses on track.

Installation requirement: the plate must be used with the inner and outer posts referenced by the maker, specifically inner post (S4-203A?1, 900) and outer post (S4-203AO?900). These posts are separate items and are needed to secure the plate and the servo assembly.

Quick setup tips: check that servo splines are centred before final clamping, select screws which clear the servo case, and tighten evenly to avoid crushing the graphite. Verify plate orientation and linkage travel after installation. Note that the part affects steering geometry and servo placement rather than motor or drivetrain characteristics.

Tuning notes: small changes to servo position or mount stiffness can shift steering centre and transient behaviour. Combine plate changes with adjustments to toe, steering rate, and servo throw to achieve the desired handling balance.