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

Yokomo Y4-S4 - SLF Big Bore Shock Cylinder (2pcs) for YD-4
Price:
NZD$31.02
Brand:
Yokomo
Model:
YOKY4S4
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SLF Large-Diameter Shock Cylinder for YD-4

This component is an RC damper element shipped as a pair designed specifically for the YD-4 chassis, delivering the enlarged internal volume expected from a big bore cylinder. The description emphasizes functional fitment rather than marketing, noting the cylinder functions as a replacement piece inside the shock assembly on compatible YD-4 models.

Compatibility should be confirmed against models listed as "for YD-4" in the product title; treat this item as a chassis-specific cylinder that works with the vehicle's existing shock bodies, pistons, seals, and fluids. Changing to this cylinder will affect damping by modifying oil flow and trapped air volume, which alters mid-stroke control and overall response for road-course tuning.

To install, disassemble the shock, remove the original cylinder, move or change internal pistons and seals as needed, and rebuild using the appropriate oil and preload for your driving conditions. Use proper RC tools and careful seal handling to prevent damage when fitting.

Specifications

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

For competitive hobbyists running YD-4 kits, these SLF big bore cylinders give a practical route to tune damper characteristics; always verify piston and seal compatibility and make small changes while testing to find the desired balance.
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.

Are any shock-body modifications required to accept these cylinders?

Generally none if your YD-4 shocks match standard dimensions, but confirm internal diameter and cap fit before committing; minor trimming of dust boots or spacers may be necessary on some builds.

What should I check for piston compatibility?

Check piston diameter and skirt clearance inside the new cylinder; if pistons do not slide freely or seals bind, use pistons and seals rated for YD-4 shock assemblies to prevent leakage and inconsistent damping.

Will big bore cylinders affect rebound or only mid-stroke?

They primarily change mid-stroke and the way the shock breathes, but overall rebound and compression behavior can shift depending on oil viscosity and piston selection, so retune as required.

Post-install checks to ensure reliability?

After installation run a short test, inspect for seepage, ensure oil level is stable, and re-torque shock tops and mounting hardware before extended use.

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