Adjustable Mixture Valve OS28181600 for RC Carburettors O.S. Engine  [OS28181600]

Service replacement valve for carburettors

The O.S. Engine OS28181600 mixture control valve is an RC-scale carburettor replacement part designed to restore or refine fuel-air mixture control on nitro engine models. It acts as an adjustable interface so you can tweak the lean/rich balance while leaving the main needle assembly in place.

This valve is intended as a carburettor-level service item rather than a full engine component, aimed at hobbyists who require consistent, repeatable tuning during practice and competition. Focus is placed on correct fitment to RC carburettors and achieving stable engine running once adjusted.

Fitting notes: remove the carburettor access cover to reach the mixture port, swap the original valve for the new unit, and ensure it seats properly. After fitting, perform short runs and make incremental adjustments until the desired response is achieved, and always check for fuel leaks afterward.

Tuning application: use the valve to refine part-throttle characteristics and idle behavior; keep a log of changes so you can return to proven settings and avoid over-tuning. This approach preserves main jet settings while improving drivability or throttle response.