This YS Engine YSS7143 product is an RC-scale nipple used as a replacement spare for glow and small nitro engine fuel systems. It is intended to replace worn or leaking feed or mounting nipples to restore proper sealing and fuel delivery.
Compatibility notes: the item is identified as a YS Engine spare component. Before fitting, make a visual comparison to the existing nipple, check the YSS7143 marking, and confirm that thread form and seating match your carburettor or engine mounting. Consult the original parts listing if clarification is needed.
Installation guidance: ensure the engine is cool and fuel is removed from the area. Remove the existing nipple, clean the mating surfaces, hand-start the new nipple carefully to avoid cross-threading, tighten to a snug finish without over-torquing, and inspect for leaks. Carry out a short supervised run to check idle stability and correct fuel flow, then adjust needles in small steps if necessary.
Tuning role: although small, the nipple is a consumable that helps maintain a secure seal at the carburettor interface, which supports consistent idling and throttle response during jetting and tuning operations.
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