OLD-10A and OLD-10D Carburettor Needle Valve Assembly - O.S. Engine OS21285900  [OS21285900]

Replacement needle valve for OLD-10 carburettors

This needle valve assembly is an RC-scale carburettor replacement designed for the OLD-10A and OLD-10D carburettors. It acts as the metering element that lets you fine-tune fuel delivery during routine tuning and maintenance on nitro RC engines.

Fit and compatibility are limited to the named carburettor models, so confirm your carburettor type before ordering. In service the assembly provides the adjustable needle interface used to set idle and part-throttle mixtures; replacing a worn assembly restores predictable needle response without replacing other carburettor parts.

Installation is straightforward for those familiar with carburettor disassembly, typically involving removal of the carburettor top, extraction of the old needle assembly, and reinstallation of the new unit with careful seating and light testing of idle and throttle response. Make small adjustments when tuning and verify engine behavior in an appropriate outdoor area for nitro RC use.