The Yokomo YOKYS1280 is supplied as a pink HSS long shock spring and is marketed as an accessory to change the behaviour of long-travel shock absorbers on scale models. The HSS identifier denotes the spring specification used in tuning.
Installation uses standard shock servicing methods: remove the shock if needed, undo the cap or retainer, slide the spring onto the shaft over the damper tube and retainer, then rebuild and check for free travel and end clearance. Ensure the spring's length and travel profile suit your shock to avoid unwanted contact when fully compressed.
When tuning, a long shock spring like this affects initial response, ride height and mid-stroke support. Pair it with spacers or adjust preload to reach the suspension characteristics you prefer for your specific model and driving style.
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