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1985- Mcv dalete?

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1985- Mcv dalete?

PostAuthor: Soldiercascade » Thu Jul 23, 2020 8:11 pm

Hey im ryan, i bought a 1985 virago for $600 from this guy, runs just missing some parts-
Mcv
All air intake piping+airbox bugeye
Little to no vacuum lines
(Atleast those are the major parts missing)

Can i run the virago without the MCV? If so what would be the new set up for the vacuum lines? Just been have no luck finding a replacement mcv. Thanks in advance

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Re: 1985- Mcv dalete?

PostAuthor: Jake » Thu Jul 23, 2020 8:24 pm

Yes, it’s not needed, just an emissions control device. The only vacuum line you need is one to the petcock, if the original vacuum petcock is used.
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Re: 1985- Mcv dalete?

PostAuthor: Soldiercascade » Thu Jul 23, 2020 9:39 pm

awesome thanks so much for the info, just 2 more quick questions. (The prev owner put on a new petcock with only a fuel line coming out)i took a close look at the carbs and i found 2 vacuum lines leading to open air that are contected to the top of each carb, 1 in the rear cylinder carb boot, 2 in the front cylinder carb boot, and an open space on the petcock. Should i hook up everything together then lead it to the petcock or should i leave the too vacuum line that lead to open air as is and hook up everything else to the petcock?

Prev owner didnt do a very good job of repair this bike sorry

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Re: 1985- Mcv dalete?

PostAuthor: Jake » Fri Jul 24, 2020 7:41 am

Plug all vacuum lines except for the rear boot. Run that one to your petcock.
_______________________________________________________________________
“It ain’t what you don’t know that gets you in trouble.
It’s what you know for sure that just ain’t so.”

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Re: 1985- Mcv dalete?

PostAuthor: Soldiercascade » Sun Jul 26, 2020 5:57 am

prefect, thanks so much for the info. I just gotta clean out my carbs and replace the cluth frictions plates and i should be off to the races. Ill be sure to post back in this thread with the result of my labor. Ride safe everyone

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Re: 1985- Mcv dalete?

PostAuthor: schocka » Tue Jul 28, 2020 11:54 am

Jake wrote:Yes, it’s not needed, just an emissions control device. The only vacuum line you need is one to the petcock, if the original vacuum petcock is used.

Does it make it any easier / harder to start the bike when this is removed? Especially in climates where the bike will be used range from 105F - 25F (below that and I just can't feel anything below my knees).

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Re: 1985- Mcv dalete?

PostAuthor: Jake » Tue Jul 28, 2020 12:11 pm

Doesn’t effect starting either way.

This isn’t exactly the thread for this, but I’ll add one thing that will improve starting. Remove the resistor from the spark plug boot and replace it with a piece of steel, copper or brass.

Instructions http://faq.f650.com/FAQs/PlugCapsnCoils ... %20Rebuild:
_______________________________________________________________________
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It’s what you know for sure that just ain’t so.”

~Mark Twain


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Re: 1985- Mcv dalete?

PostAuthor: schocka » Thu Jul 30, 2020 11:15 pm

@Jake
Man is that some deep reading. Where is the TLDR summary :bg:
Thanks and I will give this a go later.

I was only asking because removing the MCV sounds like it would mess around with the way the carbs we initially designed thus making starting harder. Or if they added this environmental friendly device after the carb was already designed, removing it would make starting easier.

Thoughts?

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Re: 1985- Mcv dalete?

PostAuthor: faffi » Fri Jul 31, 2020 3:44 am

You probably have not touched these anyway, but 21 and 22 in this schematic should not be blocked off
https://www.partzilla.com/catalog/yamah ... ir-cleaner
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