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Carb Piece Question

R

Ray1234

Forum Newbie
I'm reassembling my VM carburetor and don't know where this piece came from. Anyone know where it goes or what it does?
 

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Also, is there a guide on which carbs should have a vacuum hose from it and which ones are atmospheric pressure?
 
2 & 4 are float bowl vents, 3 has a nipple for vacuum. Take some time and check the passages, and chase where they route. It's easy to tell a vent from vacuum, the passages go different places.
 
Pretty sure, that cap is not stock.

You might want to look at some carbs from ebay. It may trigger some memories...

BTW, smart money is on changing all the O-rings while the carbs are being rebuild...

https://www.ebay.com/itm/187120220355
 
Last edited:
Listen to Nessism... you'll chase problems for ages if you don't do it right the first time.

Probably means they had a non vacuum petcock fitted & that was the way they sealed it up.... :)
 
That plugged off nipple was the hole they drilled to make the carb passage. Once it was finished drilling they squished the ball in there to cap it off. Youll see that on many carbs from many brands
 
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