Yokomo YOKY4S8 Cap Ball Set, 4pcs, Compatible with YD-4 SLF Big-Bore Dampers  [YOKY4S8]

YOKY4S8 cap balls: service parts for YD-4

The Yokomo YOKY4S8 shock cap ball set is a replacement pack designed for SLF big-bore dampers on the YD-4 platform. Supplied as a set of four, these cap balls sit in the shock cap assembly and contribute to steady piston alignment and predictable shock output during vehicle operation.

Designed solely for radio-controlled models, this RC-scale component should not be used on real vehicles. Confirm YD-4 compatibility prior to ordering to ensure a correct fit with your damper top parts.

Service procedure: the replacement is simple for anyone experienced with oil-filled dampers. Remove the shock cap, inspect the existing cap ball for wear, insert the replacement, and verify smooth movement and proper seating. Use appropriate shock tools and take care with the damper oil and seals to avoid contamination.

Role in tuning: the cap ball is a small contact element that affects seal seating and piston travel in big-bore SLF shocks. Renewing worn cap balls helps maintain consistent damping, reduces unwanted play at the cap interface, and supports repeatable tuning when you alter oil weight, piston selection, or spring preload.

Compatibility

• YD-4