Diaphragm Shock Caps for Yokomo and Associated Shocks YOKYS8D by Yokomo  [YOKYS8D]

What the diaphragm cap does

This diaphragm shock cap set fits Yokomo and Associated shock bodies and replaces the hard cap with a flexible diaphragm to help preserve internal gas pressure, reduce oil aeration, and smooth damping during repeated cycles. The flexible membrane design helps keep oil separated from air inside the damper.

Verify that your shock body matches the cap profile before installation; compatibility is limited to the brands in the product name. With the diaphragm installed, foaming is reduced and damping tends to remain more uniform through extended running.

Fitting requires standard damper disassembly: remove the shock, manage or remove oil, take off the original cap, press the diaphragm into place ensuring it is seated correctly, and reassemble with even torque to avoid pinching. After assembly gently compress the shock to check for proper movement and no leaks.

These caps support tuning by protecting oil condition; they are not a substitute for spring or oil changes but they help your selected setup stay consistent, especially on choppy or high-frequency surfaces.