O.S. Engine OS4A407030 Threaded Nipple GGT10 Carburettor Fitting  [OS4A407030]

Threaded carburettor nipple for O.S. units

This O.S. Engine carburettor nipple is supplied as a service replacement for O.S. carburettor assemblies, intended to restore correct fuel line connection and sealing during routine engine maintenance. The description concentrates on fitment, inspection points, and how the nipple mates with fuel tubing and the carburettor body on nitro models.

Before reuse, check the nipple for signs of wear, internal blockages, and thread damage. Replace the part during a carburettor rebuild or if you observe fuel seepage or restricted flow. Keep the nipple free of grit to prevent contamination of the fuel system.

Fitting is simple: clean mating faces, start the threads by hand to avoid cross-threading, and tighten until snug without over-torquing to protect the carburettor housing. Once fitted, do a static fuel flow check and a bench tune run before installing the engine back in the model.

For troubleshooting, a clogged or degraded nipple will alter fuel delivery and can upset jetting stability, so include it in routine carburettor servicing. Always use compatible O.S. carburettor parts to ensure correct sealing and thread engagement.