Yokomo YOKYSA875 is a yellow Big Bore front shock spring labelled for "All Round" use, intended to adjust front suspension characteristics on RC scale cars. It fits into shock assemblies that accept Big Bore springs and is used to change front spring behaviour.
By changing spring force and preload response, the spring affects front-end behaviour. Combine it with compatible pistons and damper oil to dial in ride height and transient response, and test iteratively on-track.
Installation is the normal shock spring routine: remove cap, change spring noting orientation, set preload, and reassemble. Verify shaft travel and freedom from binding, then recheck after a few runs.
Tips: align spring choice to travel and tuning goals, inspect for damage before reuse, and keep a set of spare springs. The yellow finish aids quick visual selection.
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