Yokomo YOKYX40SC - YRX 12 Spring Cup / O-ring Cap for Pitching Damper  [YOKYX40SC]

YRX 12 Pitching Damper Spring Cup & O-ring Cap

This Yokomo YOKYX40SC part is an RC-scale spring cup and O-ring cap intended for use on pitching damper assemblies, identified for YRX 12 fitment from the product name. Its purpose is to retain the spring seating and provide an O-ring seal interface that helps control oil movement around the damper shaft, influencing front-to-rear pitching behavior of the suspension.

In practice the spring cup locates the spring and sets its seat height while the O-ring cap provides a simple seal point to limit internal fluid migration and reduce unwanted play. When fitting, confirm the YRX 12 damper shaft and spring dimensions match the part profile before assembly, and use recommended shock oil and spring rates for the chassis to achieve predictable pitching response.

Installation advice: slide the cup into the damper body to the required stack height, place the spring onto the cup, and compress to fit the O-ring cap so the seal engages without excessive preload; verify smooth shaft travel after assembly. This product is described and used only as a 1/10 scale RC accessory component for tuning damper behavior.