YS Engine YSS7143 Replacement Nipple for Glow and Nitro RC Engines 61 80 91  [YSS7143]

Precision fuel nipple for consistent tuning

This YS Engine YSS7143 part is an RC-scale nipple intended as a replacement for glow and small nitro engine fuel systems. It is supplied as a spare to restore sealing and fuel flow where the original nipple is worn or leaking.

Compatibility notes: shown as a YS Engine spare component. Match the YSS7143 marking to your current nipple and confirm thread engagement and seat compatibility on your carburettor or engine mounting. Refer to the engine parts list if you have any doubt about fitment.

Installation guidance: drain fuel from the work area and ensure the engine is cool. Remove the worn nipple, clean the mating surfaces, carefully hand-start the YSS7143 nipple to avoid cross-threading, then tighten to a firm, non-overstressed fit. Run the engine briefly under observation to confirm steady idle and correct fuel flow, adjusting needles in small increments if required.

Tuning role: the nipple itself is a small consumable but plays a direct role in maintaining steady fuel delivery and a reliable seal at the carburettor interface, which supports predictable idle and throttle response during jetting and tuning tasks.