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

Yokomo Y4-S4 - SLF Big Bore Shock Cylinder (2pcs) for YD-4
Price:
CAD$25.00
Brand:
Yokomo
Model:
YOKY4S4
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Big Bore SLF Cylinders 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 write-up concentrates on role and fitment without promotional language, clarifying that the cylinder serves as a replacement component within the shock assembly for 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 to be used with the existing shock bodies, pistons, seals, and fluid of the model. This component influences damping by changing internal oil flow and air volume characteristics, which in turn modifies response and mid-stroke control for on-road setups.

Installation involves disassembling the shock, removing the original cylinder, transferring or replacing internal pistons and seals as required, and reassembling with the correct shock oil and preload for the vehicle and track conditions. Use standard RC tools and follow shock-handling practices to avoid damage during fitment.

Specifications

  • Item Yokomo Y4-S4 - SLF Big Bore Shock Cylinder (2pcs) for YD-4
  • Model Number YOKY4S4
  • Material Not specified
  • Compatibility YD-4

For racers and hobbyists maintaining YD-4 kits, these SLF big bore cylinders provide a simple option to alter damper feel and mid-stroke behavior; confirm piston, seal, and shaft fit before final assembly and test incremental changes on track to dial in handling.
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

Will these cylinders fit every YD-4 shock body without modification?

Fitment depends on your YD-4 shock body dimensions and mounting arrangement; if your shocks share the same internal diameter and cap interface as standard YD-4 parts, they should fit, otherwise check dimensions before install.

Should I reuse my original pistons and seals?

During dry assembly, verify piston and seal alignment; if the bore or piston profile differs, transfer compatible pistons and seals or source replacements specified for YD-4 shock assemblies to ensure leak-free operation.

How does the larger bore change damping feel on small bumps?

A larger internal volume alters oil flow and air compression, which typically yields a different mid-stroke sensation and can smooth responses on small impacts; exact effect will vary with oil weight and piston selection.

Any setup tips after fitting these cylinders?

After initial runs inspect seals for leakage, confirm oil level and viscosity are appropriate, and recheck cap torque and mount hardware following a short test session to ensure consistent performance.

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