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Discussion Starter · #1 ·
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?
 

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Discussion Starter · #2 ·
Not sure why my post looks like I don't know what paragraphs are. It looked okay in the editor???? BTW, my parts list does not show the part.
 

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I have the same model bike and I've never seen that part before. Mine just has the large, long spring that sits in that top cap (#7 in this diagram - https://www.cmsnl.com/honda-cb350k4-super-sport-1972-usa_model433/partslist/E19.html#results). That part looks like some kind of hack that a previous owner stuck in there for some reason, probably to compress the stock spring for some reason??? Maybe I'm wrong, I don't have 722A's on my bike (mine are 3D's), hopefully someone here will chime in.
 

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Discussion Starter · #4 ·
It kinda looks to me like the part will stop the plunger from coming up too far. It has a little spring inside the plastic cone (for lack of better word). The base fits right in the slot of the underside of the lid and is tight enough that it will stay once installed. Not listed in any of the carb diagrams I've been able to look at. Anyone else have an idea?
 

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That part does not belong in there. Check the spring length against the specs and replace the spring if it is too short.
 
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