This Yokomo YX-39SG spring is intended for the front push rod assembly of 1/12 competition cars, specifically for YR-X12 series chassis. The kit includes 2 pcs of gold-colored springs noted as 3.5 volumes, provided to help adjust front-end response without changing structural components.
Use this spring to fine-tune roll and initial steering feel on dedicated 1/12 racing setups. It fits the push rod location and is intended to be swapped in during setup sessions to compare handling differences; keep track of which side and orientation you fit when testing.
Installation is straightforward for experienced model technicians: remove the front linkage as required, exchange the spring while preserving washer and retainer order, and verify free movement of the push rod through suspension travel before final runs.
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