YS Engine YSS1030 50-count Needle Socket O-Ring Spare Set  [YSS1030]

Replacement o-rings for needle sockets

The YS Engine YSS1030 bundle contains fifty rubber o-rings intended to seal needle sockets in RC carburettor needle assemblies. This stock is useful for event spares and scheduled engine servicing.

These rings prevent fuel leaks at the needle seat and help sustain consistent needle-to-seat contact, contributing to steady idle and predictable mid-range mixture during tuning work. Since needle and seat geometries differ, confirm the ring fits your assembly before final installation and replace any degraded rings during routine maintenance.

To fit: remove the carburettor needle assembly, pull off the old o-ring, place the new ring on the needle socket, and reassemble. Inspect both needle and seat for scoring or wear and renew parts if the o-ring cannot form a firm seal.