O.S. Engine OS27881330 Carburettor Mixture Control Screw Compatible with 40E 6H-86 60G 60H 60L  [OS27881330]

Mixture Screw: Durability and Care

This mixture control screw is an aftermarket RC carburettor piece intended to give precise control over fuel/air ratio on compatible O.S. engine carburettors. It allows tuners to refine idle and transition response by altering the mixture setting at the carburettor, helping deliver consistent performance in nitro RC models.

Compatibility is restricted to the model codes listed in the product name: 40E, 6H-86, 60G, 60H, and 60L. Only fit this screw to carburettor assemblies that accept the same profile and thread type to prevent damage.

Installation and tuning notes:

• Install the screw in the original seating position and avoid cross-threading; make controlled, small adjustments while the engine is running to judge changes.
• If a manufacturer baseline mixture is available, work from that point and tweak in small increments for idle and throttle transitions.
• Regularly remove varnish and debris from the screw and seat; a small amount of a thread-safe lubricant can help keep movement smooth without affecting mixture readings.