If the engine is not running as sweetly as it once did, have you thought about a complete carburettor overhaul? The component shown in the image, is just one item of many you may require to achieve smooth running and first prod starting.
Surprising (and pleasing) results can be achieved by a complete strip down, sonic cleaning of the carb body components, then new jets, springs, float, seals and O-rings reassembled into the carb/s.
Other carburettor components are listed below - you may wish to add some of them to the same shopping cart?
Add as many items as you wish to the same shopping cart, new float/s 3GM1498500 pilot screw/s 12R1410500 for example, and still only pay the same single fixed price shipping cost. This component may have other, sometimes unrelated, applications within the Yamaha model range. So, please always check by the part-number rather than the description. If you are considering engine work then give this pro-workshop gasket sealant 08C70K0234M a try?