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

Function and fit

This is an RC-scale shock cap and end adaptor intended for use with the YR-X12 pitching damper assembly. It serves as a replacement cap or an end adaptor that defines the damper's top mounting interface and end position within the shock tower or linkage system.

The component is presented as a direct-fit item for YR-X12 designated dampers, so installers should confirm thread engagement and seating before final assembly. Typical installation requires basic shock disassembly, alignment of the cap to the damper body, and verification that the piston and spacer stack operate freely through the travel range.

In tuning terms, the cap/end adaptor affects the damper's end geometry and mounting height, which in turn influences how the pitching damper interacts with chassis pitch control. Use it when changing end attachments, swapping damper types, or fine-tuning linkage geometry to achieve desired pitch response.

Installation notes

• Disassemble the shock to access the original cap, then replace with the YX-40C cap/adaptor, confirming proper thread engagement and seating.
• Check free movement through full travel after reassembly to avoid binding at the new end position.
• When changing end geometry, re-evaluate damper stroke and spring preload as required by your chassis setup.