The Yokomo YR-10OA is a replacement pack of ball-seat O-rings designed for 1/10 scale formula on-road dampers. It supplies ten O-rings used when servicing or rebuilding dampers on compatible YR-10F chassis, restoring proper sealing at the ball seat and helping maintain consistent damping after teardown and reassembly.
Installation is straightforward for anyone familiar with shock servicing: remove the shock cap and piston assembly, withdraw the worn O-ring from the ball seat, carefully fit the new O-ring to avoid pinching, then reassemble and check for leaks. Use basic hobby tools and fresh damper oil to prevent contaminating the new seals.
As consumable service items these O-rings should be replaced during routine rebuilds or whenever oil leakage or inconsistent damping is noticed. They do not alter spring rates or internal valving but preserve the damper's intended performance by keeping a reliable seal.
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