Yokomo YS-8-142 F. Shock Piston — Off-Road 1.4mm Tuning Piston  [YS-8-142]

Replacement piston for off-road dampers

The Yokomo YS-8-142 F. Shock Piston is a direct replacement piston intended for off-road shock assemblies. It alters how oil flows inside the damper body to improve the feel of rebound and compression without requiring other component changes.

Fitting this piston is standard for those familiar with threaded shocks: disassemble, remove the shaft and spring, fit the new piston, and reassemble with the same seals and oil grade. Small changes in piston size or hole count will change oil passage characteristics, so use this piston to tune mid-range and low-speed damping rather than expecting a complete handling transformation.

For reliable results, adjust setups methodically: change a single item, test on a representative track or terrain, note handling differences, and only then vary oil or spring rates. This process keeps adjustments repeatable.