YR-X12/YR-X1219 Compatible Cylinder & O-Ring Pitching Damper Upgrade - Yokomo YX-40CY  [YX-40CY]

Cylinder with Kashima-style hard anodized finish

This Yokomo YX-40CY assembly delivers the cylinder, AJ adjustment nut and replacement O-rings found in the pitching damper of 1/12 on-road race cars. It is supplied as an aftermarket tuning item to alter pitching behavior and spring preload on suitable chassis.

The cylinder surface uses a Kashima-style hard anodized treatment to minimize piston-to-wall friction during stroke, aiding a predictable damping characteristic. The set focuses on replacing worn parts and making small tuning adjustments rather than a full-service overhaul.

Fitment tips: swap out compressed O-rings and verify the seal after reassembly, adjust the AJ nut to alter spring preload, and check for smooth piston travel before track use. Periodic checks after a few runs help detect O-ring wear or coating abrasion.