O.S. Engine OS27881330 Precision Mixture Control Screw for 40E 6H-86 60G 60H 60L  [OS27881330]

Precision Mixture Screw Details

This mixture control screw is an RC carburettor component built to deliver fine control of fuel and air on compatible O.S. engine carburettors. It helps tuners and model builders refine idle behavior and throttle transitions by altering the carburettor mixture setting, aiding consistent engine response on nitro RC models.

Compatibility is limited to the model codes listed in the product name, namely 40E, 6H-86, 60G, 60H, and 60L. Fit this part only to carburettor assemblies that accept the same screw profile and thread form to avoid forcing the part into incompatible units.

Installation and tuning notes:

• Fit the screw in the OEM seating position, take care not to cross-thread, and make small adjustments while the engine is running to monitor changes.
• Begin from the manufacturer's baseline mixture if available, then fine tune in small fractions of a turn for idle and throttle transition performance.
• Keep the screw and seat free of varnish and debris; a light application of a thread-safe lubricant can help preserve smooth operation without skewing mixture readings.