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Xv700 vaccuum assembly

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Xv700 vaccuum assembly

PostAuthor: TSAnderson » Sat May 04, 2019 8:35 am

Hey all, I have a new to me xv700 that purchased as a project bike. Bike currently is not running, but I know the engine is good as I saw it running 2 years ago before the owner passed.

I've since pulled all the major components off, but I am at a loss for the left side vaccuum assembly. Whoever messed with the Bike before me, removed the whole thing. There are no hoses anywhere. Woukd anyone be able to take a detailed photo of their vac assembly and where the hoses go to? Even a photo of the carb assembly would be great. Someone messed with the hoses and I'm beside myself.

I've looked everywhere but cant find a detailed photo of this. Thanks in advance!

TSAnderson
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Re: Xv700 vaccuum assembly

PostAuthor: bstig60 » Sat May 04, 2019 9:56 am

This should give you an idea of where things go. https://www.partzilla.com/catalog/yamah ... ir-cleaner https://www.partzilla.com/catalog/yamah ... -49-states
If item 15 has been removed, then item 20 has one port going to the petcock and to one of the carb holder vacuum ports adn the other port on item 20 will be capped.
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province, and Country.
It is easier to help you if we know where you are.


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Re: Xv700 vaccuum assembly

PostAuthor: Jake » Sat May 04, 2019 2:12 pm

The only vacuum line you really need is from carb holder to petcock, that is of course if the vacuum petcock wasn’t switched out for a manual one. If the latter is the case, you won’t need any vacuum lines.

As far as the apparatus on the left side, if it’s been removed, it will not affect the way your bike runs, some say it runs better without. All it is, is an emissions control of sorts.

You can follow this to make sure everything is capped off properly http://viragotechforum.com/viewtopic.ph ... 8ae33ff866 .

The only difference is the 1000/1100 have an additional vacuum line to the pressure sensor and the 700/750 doesn’t have a pressure sensor.

Here is the vacuum diagram for the 700/750

7E1AA59D-E609-4151-82A3-A304831D4A83.jpeg
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Re: Xv700 vaccuum assembly

PostAuthor: TSAnderson » Sun May 05, 2019 5:14 pm

Thanks guys.

Basically what I have is item 15 removed. The hoses from item 15 that would run to the elbow are removed and only the top niple is capped, the other is open. I have one gas line running directly from the petcock, it splits into 2, and one line goes to each carb. Does that sound right?

Thanks so much.

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Re: Xv700 vaccuum assembly

PostAuthor: Flyingdog » Mon May 06, 2019 3:59 am

TSAnderson wrote:only the top niple is capped, the other is open Does that sound right?


Kinda...as Jake said: since you have the MCV removed, you have to rearrange things so "both" nipples on the front manifold should be capped and the rear nipple (manifold) will have to be connected to the petcock, so the petcock will pass the fuel to the carbs. Meaning: each of the manifold nipples will either be capped or have a vacuum hose attached. "Nothing should be left open".
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Re: Xv700 vaccuum assembly

PostAuthor: TSAnderson » Mon May 06, 2019 8:48 am

https://ibb.co/MpF7hYN
https://ibb.co/xFCvrH0
https://ibb.co/0ntgC37

Thanks for your help, still a little confused though.

To clarify, items #1 and #2 both need to be capped, and item #3 needs to be capped. Is this correct?

You can see that I have one fuel line (yellow) running from the petcock, which splits into two, and goes to each carb.

Is this correct?

*I put the numbers in photos for easy reference.

Thanks for your help.

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Re: Xv700 vaccuum assembly

PostAuthor: Jake » Mon May 06, 2019 10:04 am

TSAnderson wrote:
To clarify, items #1 and #2 both need to be capped, and item #3 needs to be capped. Is this correct?


Two of the three need capped (doesn't matter which two). The third one, in this case the one you have marked as number "2", needs a line that runs to the petcock. That is a vacuum line that will automatically stop the flow of fuel when the engine is stopped and open when the engine is started.

84 petcock.jpg




TSAnderson wrote:You can see that I have one fuel line (yellow) running from the petcock, which splits into two, and goes to each carb.

Is this correct?



That part is correct.
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_______________________________________________________________________
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It’s what you know for sure that just ain’t so.”

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XVS650 manual petcock, Hard Krome Double D exhaust.
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Re: Xv700 vaccuum assembly

PostAuthor: Jake » Mon May 06, 2019 10:27 am

I would take the cap from 3 and use that port for the carb vacuum line.

84 petcock.4.jpg


84 petcock.3.jpg


Cap 1 and 2.
Use 3 to petcock, simply because it's on the left side.

84 petcock.2.jpg
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_______________________________________________________________________
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It’s what you know for sure that just ain’t so.”

~Mark Twain


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XVS650 manual petcock, Hard Krome Double D exhaust.
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Re: Xv700 vaccuum assembly

PostAuthor: TSAnderson » Mon May 06, 2019 1:04 pm

Awesome! Thank you.

Currently the petcock only has one line running from it, the yellow gas line.

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Re: Xv700 vaccuum assembly

PostAuthor: bstig60 » Mon May 06, 2019 4:06 pm

As Jake pointed out, you need a vacuum line to the petcock as it is vacuum operated. All other vacuum ports on both carb holders should be plugged. Nothing left open..
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province, and Country.
It is easier to help you if we know where you are.


SERVICE MANUAL DOWNLOAD LINK
http://viragotechforum.com/viewtopic.php?f=220&t=31501#p279545

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Re: Xv700 vaccuum assembly

PostAuthor: criewerts » Sat May 16, 2020 6:50 am

i have the same issue on my '88 750, my question is with the larger ports on the inner faces of the carbs. labeled vents, connected with a t coupling. where does the other end go? and does the end need a check valve? also the tube that operate the big diaphragms on the carbs, do they just sit in the left bug eye or do they connect to a device ?
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Re: Xv700 vaccuum assembly

PostAuthor: Flyingdog » Sun May 17, 2020 3:48 am

criewerts:
You'd probly get more responses if you'd introduce yerself in "New Member" section...then post your own thread in the 750 section. Seemings how this thread is a year old and bout a 700. Kinda how things seem to be done round here to keep things in semi-order. :bg: If/when you do, you'd also should put a general location, in yer profile. US models (Cali vs non-cali), use two different carb set-ups (Hitachi/Mikuni). Have 'no' idea bout overseas models.
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