I have a 72 CB350 that I decided to clean out the carbs on and I found that there is a piece missing under the lid of one of the carburetors. They are Keihin 722A. Here are kinks to two pictures that may help identify the part. Not sure how to attach the photos.The first shows the part on the underside of the lid. Little plastic piece with a spring in it.url]https://ibb.co/fLPE2w[/url] This the piece.https://ibb.co/izfbFG Just need to know about the part. I think that it was missing while the bike was running before. Is it a critical part?