Yokomo YOKY4S4 - SLF Big Bore Shock Cylinder (2pcs) for YD-4  [YOKY4S4]

SLF Big Bore Shock Cylinder for YD-4

This item is an RC-scale damper part supplied as a set of 2pcs intended for use on the YD-4 chassis, providing the larger internal volume associated with a big bore shock cylinder. The description focuses on role and fitment rather than marketing claims, clarifying that the cylinder is a replacement component for the shock assembly on compatible YD-4 kits.

Compatibility is limited to units listed as "for YD-4" in the product name, and the part should be treated as a chassis-specific shock cylinder intended to be used with the existing shock bodies, pistons, seals, and fluid of the model. This component affects damping by changing internal oil flow and air volume characteristics, which in turn alters response and mid-stroke control on on-road setups.

Installation requires disassembly of the shock, removal of the original cylinder, transfer or replacement of internal pistons and seals as needed, and reassembly with the appropriate shock oil and preload settings for the vehicle and track conditions. Use standard RC tools and follow the shock manufacturer’s torque and seal handling practices to avoid damage during fitment.

For racers and hobbyists who maintain YD-4 kits, these SLF big bore cylinders offer a straightforward way to alter damper feel and mid-stroke control; confirm piston, seal, and shaft fit before final assembly and test incremental changes on track to dial in handling.