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

Tuning Notes and Adjustment Tips

This mixture control screw functions as an RC carburettor adjustment component, offering tuners fine control over the fuel/air mixture on compatible O.S. engine carburettors. It influences idle stability and throttle transition by modifying the carburettor mixture setting to help achieve predictable engine response during running.

Compatibility is confined to the model identifiers in the product name: 40E, 6H-86, 60G, 60H, and 60L. Only use the screw in carburettor assemblies that accept the same screw shape and thread to avoid improper fitment.

Installation and tuning notes:

• Place the screw in the OEM seating position, avoid cross-threading, and alter settings in very small steps while observing engine behavior to find the best response.
• Start from the recommended baseline mixture when available, then refine using fractional turns for idle and transition tuning.
• Maintain cleanliness of the screw and its seat; removing varnish and debris and applying a small amount of thread-safe lubricant can keep adjustments smooth without affecting mixture accuracy.