Yokomo YOKYS8D Nitrile Diaphragm Caps compatible with Yokomo and Associated  [YOKYS8D]

Product summary: diaphragm shock caps

This diaphragm shock cap set is designed for use on Yokomo and Associated shock bodies. The caps swap the usual solid top for a flexible nitrile membrane that helps hold internal pressure, lower oil aeration, and keep damping behavior more predictable under repeated compression cycles.

Only fit these to shock designs that match the cap shape and dimensions listed in the product name; confirm compatibility before swapping parts. By separating oil from air, the diaphragm reduces foaming and helps maintain stable damping throughout a run.

To fit the caps, remove the damper from the model, control the oil when opening the assembly, take off the original cap, position the diaphragm so it sits flush, and reassemble carefully to avoid pinching the edge. After reassembly, compress the shock slowly to test for leaks and smooth action.

For tuning, view the diaphragm as a reliability aid rather than a replacement for proper spring and oil choice; it helps protect your oil properties so your selected tune stays effective session after session.