Hard-Rate Spring for YRF001 Kingpin Suspension YOKYF14SH by Yokomo  [YOKYF14SH]

High-rate spring option for kingpin shocks

The Yokomo YOKYF14SH hard spring serves as a replacement tuning spring compatible with the YRF001 kingpin suspension layout. It is intended to raise spring rate without the need to alter shock bodies or piston assemblies.

Installation is straightforward: slide and compress the spring onto the shock shaft in place of the existing unit, confirm correct seating on the perch, then verify preload and travel clearance prior to use. Match springs on both sides to maintain balance and pair this change with shock oil or piston tuning for finer adjustments.

On-track role: selecting this harder spring reduces chassis roll and boosts mid-to-high speed steering bite, ideal for tighter turn-in on higher-grip surfaces or when compensating for a softer chassis setting. Keep an eye on tire wear and steering feedback to fine-tune further.