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Air cut off valve

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Air cut off valve

PostAuthor: brywata23 » Tue Feb 11, 2020 7:52 pm

My 1996 xv535 virago has a air assist cut off valve on the left side of my bike. What is this used for? Do I need to keep it on my bike or could I remove it? What does it hook up to?

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Re: Air cut off valve

PostAuthor: mark75 » Thu Feb 13, 2020 1:51 pm

brywata23 wrote:My 1996 xv535 virago has a air assist cut off valve on the left side of my bike. What is this used for? Do I need to keep it on my bike or could I remove it? What does it hook up to?



I am guessing you refer to the fuel petcock? >>> #48? >>> https://www.mrcycles.com/oemparts/a/yam ... /fuel-tank

you probly could remove it, but (like it's bigger brothers) you would want to include an in-line fuel-cut-off valve.
maybe something like this? >>> https://www.amazon.com/Briggs-Stratton- ... B0038U3JKM

to prevent possible crankcase flooding if float-valve fails to function properly
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Re: Air cut off valve

PostAuthor: Flyingdog » Fri Feb 14, 2020 3:13 am

brywata23 wrote:My 1996 xv535 virago has a air assist cut off valve on the left side of my bike. What is this used for? Do I need to keep it on my bike or could I remove it? What does it hook up to?


I thought brywata23 was referring to---> #24 <---> https://www.yamahapartshouse.com/oempar ... 6a/exhaust. If so.."NO" you do not need this unit--"IF" it's not functioning. It controls the air intake to the carbs at certain throttle positions. (Emissions)..You can see that everything is tied together with the air filter/reed valve set-up. "BUT", if removed (or just the function is eliminated from the system), you will have to plug up "all" the associated ports..and...carefully monitor the performance of yer engine, over all. As you may/could/probly will end up with too much or not enough air intake at certain throttle positions. That's something only you can figure out while riding.
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Re: Air cut off valve

PostAuthor: mark75 » Sat Feb 15, 2020 11:20 am

535 version of AIS/MCV?
"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride" ... E.A. Poe


Time flies >>> whether you're having fun __ :bike: or not :fan: ---

Any day above ground is a good day.
so Laissez les bon temps roulez. just roll safely --- Semper Vigilans...always watchful

"I hear and I forget, I see and I remember, I do and I understand." ... Confucius*

If you don't read the news you are not informed.
If you read the news you are misinformed.
... Mark Twain


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The views, opinions, and experiences expressed in this post are mine and may not necessarily represent views and opinions of other VTF members, so feel free to agree, disagree, or ignore them.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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Re: Air cut off valve

PostAuthor: Flyingdog » Sun Feb 16, 2020 3:57 am

mark75 wrote:535 version of AIS/MCV?


That's the way I took it... apparently the 535 models calls the MCV an "air cut valve" vs. bigger Virago(s) use the term MCV. Only difference, I see..MCV uses atmospheric air (suck'n the paper test when throttle is chopped) and air cut valve goes direct to air filter. Go figure...heh. No matter..everything usually gets dumped anywho. Probly why Yamaha is the "parts bin bikes" of the cycle world. :bg:
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