These O rings, made from NBR rubber in the UK to OEM specifications, are designed to fit most carburettor fuel and air pilot mixture screws with a shaft diameter of approximately 2.8-3.0mm.

The stainless steel washers included in this package are also compatible with these screws.

The O rings, when fitted to the fuel screws, help to ensure smooth RPM operation, particularly at low throttle openings and idle. They are a necessary component for optimal engine performance.