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Mixture control valve

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Mixture control valve

PostAuthor: bmack » Thu May 22, 2008 8:55 am

I have a bad mixture control valve. Has anyone just plugged the two vacuum hoses instead of replacing the valve? I heard that it will run as well or better.
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Re: Mixture control valve

PostAuthor: oldschool169 » Thu May 22, 2008 11:20 am

took mine off runs fine

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PostAuthor: club_c » Thu May 22, 2008 11:25 am

'82 750 right? I disabled mine on the 920, no probs. BTW, please add your bike and year to your signature so we can quickly know what you are working on.
clubbie 1982 XV920J shaft drive, kinda custom (sold)
1981 XV920R chain drive, complete restoration (sold)
2001 BMW R1150RT - new purchase
1985 BMW K100RS - needed much love, now done, my best resto yet
1985 BMW K100RT - needs freshening up. I'm sensing a trend...

must......stop..........buying......bikes.........
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PostAuthor: bmack » Thu May 22, 2008 12:08 pm

Did you plug the vacuum hose or just leave them alone? I resubmitted my signature, sometimes my bike info dissapears. Thanks.
If it ain't broke, I'll fix it 'till it is! :doh: 82' xv750
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PostAuthor: club_c » Thu May 22, 2008 12:25 pm

It all came off right to the rubber intake manifolds, and then I used a couple of vacuum plugs to block the ports at the manifolds. You can't leave those open or you'll have a vacuum leak and no end of poor running conditions.
clubbie 1982 XV920J shaft drive, kinda custom (sold)
1981 XV920R chain drive, complete restoration (sold)
2001 BMW R1150RT - new purchase
1985 BMW K100RS - needed much love, now done, my best resto yet
1985 BMW K100RT - needs freshening up. I'm sensing a trend...

must......stop..........buying......bikes.........
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Re: Mixture control valve

PostAuthor: Verbious » Thu May 22, 2008 1:13 pm

As stated, definitely plug all the vacuums that you pull off.

As far as your signature goes, you have to turn it on so that it is always displayed. It is somewhat convoluted to get to.

Here is how you have it on all the time:

Click on Profile near the top center of the ViragoTechForum home page

Then click on the "Profile" Tab

Then click "Profile Settings"

Then click "Posting"

Check the radio button that says "Always attach my signature"

Submit and BINGO! your signature will always display at the bottom of your posts and you will not have to worry about selecting "Attach Signature" which are under the options directly below this input box when you are making a post or replying to a post.
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PostAuthor: bmack » Thu May 22, 2008 1:13 pm

Thanks club_c, and old school.
If it ain't broke, I'll fix it 'till it is! :doh: 82' xv750
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PostAuthor: kingzero » Mon May 26, 2008 8:26 pm

Dosen't one of the hoses run to your right petcock.
One hose runs to a three way splitter. If you just plug the two ports this will negate the petcock vacuum. By the way I need you guys to school me on just what this overpriced salt shaker does.
Work is for people without Viragos
1982 VT750J

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PostAuthor: bmack » Mon May 26, 2008 10:44 pm

Thats a good point, I don't know if it negates the vacuum on the petcock. Anybody know?
If it ain't broke, I'll fix it 'till it is! :doh: 82' xv750
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Re: Mixture control valve

PostAuthor: grazingazer » Tue May 27, 2008 7:01 am

maybe this diagram might help...i found it in our archives which are accessable by using the search feature on the left side of the page or
http://viragotechforum.com/phpBB/search ... de=results as you can see...if you remove the mcv with it's hoses and plug only the large nipple on the right side manifold...then run a vacuum hose from the small nipple to the right side petcock...you will have your vacuum
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PostAuthor: dhew » Tue May 27, 2008 10:47 am

Thats exactly what i did and my bike was running fine.
:blast: 1981 Yamaha XV750

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PostAuthor: bmack » Tue May 27, 2008 1:35 pm

I know I'm probably getting on you guys nerves as I'm a little thick headed, but I'm not getting the smaller vacuum hose. I plugged both (large and small dia.). The small hose goes to the tee that one branches to the right side petcock. Is this wrong?
If it ain't broke, I'll fix it 'till it is! :doh: 82' xv750
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PostAuthor: dhew » Tue May 27, 2008 3:13 pm

Run the hose from your petcock to the small one.
Plug the large one.
:blast: 1981 Yamaha XV750

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PostAuthor: bmack » Tue May 27, 2008 3:23 pm

do I plug up the end of the small one (the end that would have plugged into mvc)?
If it ain't broke, I'll fix it 'till it is! :doh: 82' xv750
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PostAuthor: club_c » Tue May 27, 2008 3:56 pm

You have two petcocks and two manifolds. One manifold services one petcock each. Right side manifold services right side petcock, left side manifold services left side petcock. All other ports are blocked off.
clubbie 1982 XV920J shaft drive, kinda custom (sold)
1981 XV920R chain drive, complete restoration (sold)
2001 BMW R1150RT - new purchase
1985 BMW K100RS - needed much love, now done, my best resto yet
1985 BMW K100RT - needs freshening up. I'm sensing a trend...

must......stop..........buying......bikes.........
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PostAuthor: club_c » Tue May 27, 2008 3:57 pm

bmack";p="100247 wrote:do I plug up the end of the small one (the end that would have plugged into mvc)?

yes
clubbie 1982 XV920J shaft drive, kinda custom (sold)
1981 XV920R chain drive, complete restoration (sold)
2001 BMW R1150RT - new purchase
1985 BMW K100RS - needed much love, now done, my best resto yet
1985 BMW K100RT - needs freshening up. I'm sensing a trend...

must......stop..........buying......bikes.........
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PostAuthor: grazingazer » Tue May 27, 2008 4:06 pm

plug only the large nipple on the right side manifold...then run a vacuum hose from the small nipple to the right side petcock...you will have your vacuum...you can discard the mcv with the hoses still on it
if you're asking for help please include the year and model of the bike in your signature
then turn your signature on

my bike is a modified 1981 virago xv75012927the rockabilly rat
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PostAuthor: bmack » Tue May 27, 2008 5:13 pm

The light just came on, I finally understand. Thanks
If it ain't broke, I'll fix it 'till it is! :doh: 82' xv750
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PostAuthor: kingzero » Tue May 27, 2008 6:19 pm

Thanks for all the information. But, does anybody know what the valve actually does??
Work is for people without Viragos
1982 VT750J

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PostAuthor: Matthew » Tue May 27, 2008 7:10 pm

epa emmsion stuff, injected air over a certain rpm...
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