OLD-10 Series Needle Valve Assembly for OLD-10A, OLD-10D - O.S. Engine OS21285900  [OS21285900]

Precision needle assembly for OLD-10 series

This needle valve assembly is an RC-scale carburettor replacement designed for the OLD-10A and OLD-10D carburettors. It functions as the metering element to help you dial in fuel delivery during setup and routine tuning of nitro RC engines.

Compatibility is confined to the listed carburettor models, so verify your carburettor before purchase. In use the assembly supplies the adjustable needle needed to set idle and part-throttle mixtures; swapping a worn assembly returns consistent needle action without changing other carburettor components.

Fitting is familiar work for those used to carburettor service: remove the carburettor top, withdraw the old needle assembly, and seat the new part carefully, then perform light idle and throttle checks. Make incremental needle adjustments when tuning and assess engine response in a safe outdoor area for nitro RC running.