Yokomo YX-40C Shock Cap and End Adaptor for YR-X12 Pitching Damper  [YOKYX40C]

Purpose and compatibility

This component serves as a replacement cap or an end adaptor for the YR-X12 pitching damper assembly, creating the top mounting interface and defining the damper's end position within the shock tower or linkages.

The part is presented as a direct-fit solution for YR-X12 dampers; when installing, confirm thread engagement and seating before final tightening. Typical service includes disassembling the shock, aligning the cap onto the damper body, and ensuring the piston and spacers run freely through the travel.

In practical tuning terms, the cap/end adaptor adjusts the damper's end geometry and mounting height and therefore changes how the pitching damper affects chassis pitch. Fit this item when swapping end fittings, exchanging damper types, or refining linkage geometry to achieve the desired pitch behaviour.

Installation notes

• Take the shock apart to access the original cap, then fit the YX-40C cap/adaptor and check thread seating is correct.
• Verify free movement across the full stroke after reassembly to avoid binding at the revised end point.
• If you alter the end geometry, reassess damper stroke and spring preload to match your vehicle setup.