This YS Engine YSS7143 nipple is an RC-scale replacement for glow and small nitro engine fuel systems. It is intended as a direct spare when the feed or mounting nipple shows wear or begins to leak, keeping installations tidy and serviceable.
Compatibility notes: the item is supplied as a YS Engine spare component. Before fitting, visually confirm the YSS7143 marking and check that the thread form and seating match your carburetor or engine mounting point. If unsure, compare with the original parts list for your YS Engine model.
Installation guidance: work with the engine cooled and fuel removed from the area. Remove the old nipple, clean mating faces, hand-start the new YSS7143 nipple to avoid cross-threading, tighten snugly without over-torquing, and inspect for leaks. Perform a short supervised run to verify idle and fuel flow, then adjust needle settings incrementally if needed.
Tuning role: while small, the nipple helps maintain a reliable fuel seal at the carburetor interface so that idling and throttle response remain consistent when jetting or adjusting needle position.
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