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.