Serpent 500901 Shock piston 13mm 2-hole 1.6mm replacement part  [SER500901]

Shock piston for 13mm dampers

This Serpent 500901 piston is a dedicated RC-scale shock piston sized for 13mm shock assemblies and specified as a 2-hole, 1.6mm bore design. It is intended as a replacement or tuning option for 13mm damper setups where altering oil flow characteristics is required during suspension tuning and routine service.

Role in tuning: The number of ports and the bore diameter directly influence oil flow past the piston, so swapping pistons is a standard method to fine-tune low-speed and mid-speed damping response without changing spring rates or shock geometry. A 2-hole 1.6mm piston offers a specific flow characteristic compared with single- or multi-hole designs, allowing incremental adjustments to compression and rebound behaviour when paired with appropriate shock oil.

Installation notes: Work on a clean bench, disassemble the shock by removing the cap and shaft, then slide out the piston from the shock shaft. Replace the piston with the Serpent 500901 unit, checking piston thread fit and o-rings for damage. Lightly lubricate o-rings and shaft with shock oil to avoid tearing on assembly, reassemble the shock, and cycle the shaft to confirm smooth operation and no air pockets remain before final assembly on the model.

Compatibility and checks: This piston is sized to fit 13mm shock bodies that accept threaded or press-fit 13mm pistons depending on the shock design. Verify thread type and shaft compatibility before installation, and match piston selection with chosen shock oil viscosity and spring rates for predictable tuning results.