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Vacuum/Vent line help [PENDING]

Have a question about fixing something on a Yamaha Virago XV920? Post it here!
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Vacuum/Vent line help [PENDING]

Post by Hayama » Thu Nov 24, 2016 6:13 pm

I've recently purchased a basket case XV920. Most parts were in great condition, however the previous owner pulled all the vacuum and vent lines. To my knowledge, I can safely cap all the plugs on the carb boots and my particular year bike (1981) was blessed with not having a mixture control valve or coasting enrichement circuit. While doing an engine rebuild, I noticed that the front right cam cover has a vent line that has been disconnected. Many XV920s that I see online do not have that line. Is it safe to assume that I can cap it or do I have to put some sort of filter on it? Is there any other vent or vacuum line that is absolutely neccesery?

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Re: Vacuum/Vent line help

Post by Rob » Fri Nov 25, 2016 4:54 am

Welcome to Virago Help! I can help you with this problem. There is of course something you don't want to block. This is the vacuum lines going to the fuel petcocks. Those are vacuum operated and if not connected you will not get any fuel to the carburetors. As far as I know everything else can be blocked off. This is a good idea as these bikes being so old have a good chance of small vacuum leaks. Especially the connection you asked about that is located on the cam cover. This vacuum connection is for the mixture valve, or lean run valve. As far as I know this can be blocked off without any issues. Hope this information helps. If you need them, we have repair manuals, Chilton, and Haynes, in PDF format. Just let me know and I will PM you the download link for them. Peace.

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Re: Vacuum/Vent line help [PENDING]

Post by Bogie000 » Fri May 29, 2020 6:36 am

Did you ever get a handle on the vacuum lines. I am in the same situation

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