fuel vacuum valve

If it's broken or just needs tweaked

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Tommysparta
Posts: 8
Joined: Sun Sep 02, 2018 8:40 pm

fuel vacuum valve

Postby Tommysparta » Sun Dec 02, 2018 3:58 pm

1982 cb650. My fuel vacuum valve is not part of the petcock valve, its mounted on Carb #4 (stock). I can find a replacement for the valve to allow fuel to flow. I've searched everywhere for a replacement with no success. Will a petcock valve with the vacuum valve build in, fit on my CB 650, or can I run the bike without the vacuum valve as long as I remember to shut off the petcock. (Just got the bike running beautifully and it shut down....no fuel to the carbs). Thank you

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Volker_P
Posts: 5377
Joined: Mon Mar 06, 2006 1:53 am
Location: southern Germany

Re: fuel vacuum valve

Postby Volker_P » Tue Dec 04, 2018 2:57 am

Tommysparta wrote:.. or can I run the bike without the vacuum valve as long as I remember to shut off the petcock.

Yes, most previous models are just like that.
You should plug the vacuum nipple for this valve at the carbs however.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

Tommysparta
Posts: 8
Joined: Sun Sep 02, 2018 8:40 pm

Re: fuel vacuum valve

Postby Tommysparta » Sat Dec 08, 2018 10:18 pm

Thank you. I by-passed the valve and it seems to run fine. I'd like to replace the valve since I know I will forget to turn off the petcock at some point. Any leads as to where I can find one? Thanks again.

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Folsoml
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Location: North Florida

Re: fuel vacuum valve

Postby Folsoml » Tue Dec 11, 2018 8:25 am

Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,


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