YRX 12 Pitching Damper Upgrade: Spring Cup with O-ring Cap - Yokomo YOKYX40SC  [YOKYX40SC]

Spring Cup and O-ring Cap for Tuning Pitch

The Yokomo YOKYX40SC spring cup and O-ring cap is designed for pitching dampers and marked for YRX 12 compatibility. It positions the spring and provides an O-ring seal that helps limit oil migration past the cup, which influences how the suspension pitches under acceleration and braking.

Functionally, the cup defines the spring seat and stack height while the O-ring cap reduces internal fluid movement and takes up free play in the damper. Before fitting, confirm the YRX 12 damper shaft and spring sizes match this part and select shock oil and spring rates that complement your tuning goals.

Fitting notes: locate the cup at the desired stack, fit the spring, then compress to seat the O-ring cap so the seal engages without creating binding; always verify smooth shaft travel and adjust preload as needed. This is a 1/10 scale RC tuning accessory to refine damper behavior.