Todays "greener" fuels can play havoc with an older fuel system. Failure to drain the carburettor for the winter lay up allows the petrol to turn into varnish, blocking the jets and coating the float and float chamber, sometimes to the point where it becomes so difficult to clear; replacement of the affected parts may give preferable results?
If you are overhauling your carbs, or just carrying out a light service, then this component and perhaps some of those listed below maybe required:
Add as many carburettor service items (or anything else you fancy for that matter) as you wish to the same shopping cart, new O-rings 1HX1414700 washers 1371415300 and screws 1HX145650098580040089858004010 for example, and still only pay the same single fixed price shipping cost.
This part may have other applications within the Yamaha model range.