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Virago 535 '95 - One cylinder only (Rear) [photos inside!]

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Virago 535 '95 - One cylinder only (Rear) [photos inside!]

PostAuthor: Alvega » Sun Jan 31, 2021 2:27 pm

Hello everyone

I am looking for some help.

I just found a 1995 Virago 535 that has been sitting.
It has 20.000km/12.000 miles.

It is idlling (and running???) only in the back cylinder.
The front cylinder is dead cold!

Did anyone of you have experienced the same thing?

Any tips, advices or help is welcome!

Thank you!
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Jan 31, 2021 2:41 pm

I will give you more details about this issue:

When I picked up the I rode it back home (160km/100 miles) and it was a bit jerky sometimes, idling high when pressing the clutch or when in neutral.
But otherwise I "think" it was riding quite ok.
It is my first V Twin.

At one point I reached 110km/h / 70mph and i felt that there was more power left.
I dont know if this detail might be helpful.

I didnt have time to take care of the bike for a few weeks.
When I got back, it was very cold (1 º C) , I turned on the choke, hit the starter and the bike started right up, immediatly, I was even surprised.

It was idling ok.

And then I realized that the front cylinder was absolutely cold.
The back cylinder was hot and getting hotter.
The front cylinder was still cold.

I turn off the bike, started it again and the still the same, back cylinder hot, front cylinder cold.

I checked the plugs.

Back Cylinder plug (idling):

Image




Front cylinder plug (NOT idling):

Image
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Jan 31, 2021 2:54 pm

As you can see, the spark plugs look quite different.


Image


They are NGK BPR7ES.

Next step, I switched the spark plugs in the cylinders.

Start button, and the bikes fires up immediatly and idles ok, but only in the back cylinder.

To be 100% sure, with the bike running, I removed the spark plug wire in the front cylinder and nothing changed.

Then I turned off the engine.
I installed the spark plug wire back in the front cylinder and removed the wire in the back cylinder.

I tried to start the bike but it didnt fire up.

Then I checked for spark in the fornt cylinder (the non running):

Image

I dont know if you can see, there is a shiny blue spark.
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Jan 31, 2021 3:04 pm

I tried to give you as many details as I could.

I hope you are patient enough to read everything. :bg:

So know I am out of ideas, I hope you can help.

I will try to do whatever you suggest and will keep this updated.

Thank you
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: mark75 » Sun Jan 31, 2021 4:02 pm

appears the front cylinder is not firing -
1st I would check the connections on the coil are clean, shiny, tight.
see if the spark plug cap and cable are ok - maybe cut-off ~1/2" (12-15mm) of the cable behind the cap and re-seat the cap into 'fresh' cable end.

and as always,,, keep the battery fully charged.

keep us informed on results.
"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

“THESE are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman.
Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph. What we obtain too cheap, we esteem too lightly: it is dearness only that gives every thing its value.
Heaven knows how to put a proper price upon its goods; and it would be strange indeed if so celestial an article as FREEDOM should not be highly rated”


Thomas Paine --- 1776 December 23


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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Jan 31, 2021 4:17 pm

mark75 wrote:appears the front cylinder is not firing -
1st I would check the connections on the coil are clean, shiny, tight.
see if the spark plug cap and cable are ok - maybe cut-off ~1/2" (12-15mm) of the cable behind the cap and re-seat the cap into 'fresh' cable end.

and as always,,, keep the battery fully charged.

keep us informed on results.


Thank you for your post.

I will try that in the weekend, it's my only freetime.

The battery it seemed ok but anyway it is connected to the charger.

I will check for the coils, where are they? I dont remember seeing them.

The cap is "bolt on" in the spark wire?
Or otherwise how do I cut the cable and reconnect everything?
I am sorry about the silly question. :bg:

I will keep you all updated.
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: mark75 » Mon Feb 01, 2021 5:07 pm

this thread may help >>> viewtopic.php?f=5&t=7049

there is a current thread about changing spark plug caps [the OEM ones were NGK, and some are 're-buildable' - meaning they can be taken apart]
the cap can 'screw' on to the end of the cable, and the caps that can be rebuilt have a screw-slot in the visible brass 'connection'.

I will add the link to Jake's post with that info. >>> viewtopic.php?p=497936
go to his post. his link is at the end there.
"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

“THESE are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman.
Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph. What we obtain too cheap, we esteem too lightly: it is dearness only that gives every thing its value.
Heaven knows how to put a proper price upon its goods; and it would be strange indeed if so celestial an article as FREEDOM should not be highly rated”


Thomas Paine --- 1776 December 23


-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Feb 07, 2021 3:40 pm

mark75 wrote:this thread may help >>> viewtopic.php?f=5&t=7049

there is a current thread about changing spark plug caps [the OEM ones were NGK, and some are 're-buildable' - meaning they can be taken apart]
the cap can 'screw' on to the end of the cable, and the caps that can be rebuilt have a screw-slot in the visible brass 'connection'.

I will add the link to Jake's post with that info. >>> viewtopic.php?p=497936
go to his post. his link is at the end there.


Thanks for the links!
Very interesting! :cl:
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Feb 07, 2021 3:45 pm

Meanwhile I have some news.

In the weekend, I didnt have as much free time as I wanted so I really didnt solve the problem.

During the week I have been searching online and this looks like a common problem.

I will keep updating as much as I will be able to work on the bike.
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Feb 07, 2021 4:06 pm

So I had 1h to work on the bike.

As the last time I had spark, I decided to check the carbs.

Remember, this is a 20.000km/12.000 miles '95 bike.
It has been sitting after a few months (at least).

So I went for the carb/cylinder thast's is not running.

Image

I was quite surprised with this mix of screws. :ops:
It makes me think that someone has already been playing around.

Image



It wasnt that bad I guess...

Image

Image

Image





This Jet don't look in a very good shape, the pilot jet was also damaged in the head.

Image
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Sun Feb 07, 2021 4:16 pm

The pilot jet seemed a bit dirty, when pointing to the light I couldnt see through.

After carb cleaner and compressed air, it looked better.

Then I had some doubts about the float height, I took this video as a reference:

https://youtu.be/644g8W9VNS0

Mine was way too high, I set it just like in the video.

Is this a good procedure?



I started cleaning the 2nd one but I didnt finnish.

I will continue next weekend.
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Tue Feb 16, 2021 1:45 pm

I am back. :bg:

I wont let this thread abandoned til I solve the problem.

When I first started searching the internet for other people/bikes with the same issues, I found dozens of messages/topics but there was never a conclusion/solution for the problem.

So, I continued checking the carbs:

Diaphragms ok.

Image


Then mixture screws:

The rear cylinder (ok) had 2 turns, the front cylinder (no good) 2,5 turns.

I put it both to spec: 2 3/4.

I was hoping to have some luck but no, nothing changed.

Despite having spark in the front cylinder, I checked coils, spark plug wires and caps.


Image

I cleaned up everything and the contacts also.

I bought a Haynes manual and with a multimeter I checked the coils etc etc as showed in the book.
Everything was to spec.

At this point I was a bit lost.
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Tue Feb 16, 2021 1:53 pm

When I was searching for causes for this problem, a few people suggested a carb synch.

Well at this point I had nothing else to try, even if I didnt gave the tools for it.

So I started the bike and gently playing with the sync screw.

I couldnt believe.

The engine sound changed and the front cylinder got hot quickly!

Both cylinders are idling now! :bg: :bg: :bg: :bg:

As you can imagine, my carbs are still out of sync.
I ran out of free time.

I will try to fix that this weekend.

I will keep this thread updated.


:cl:
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Timbox3899 » Wed Feb 17, 2021 9:48 am

Good trouble shooting and way to keep at it. Glad that she is running better, maybe you can borrow a sync tool form someone in your area? Might even have a parts store that lends tools out.

With any bike that has been sitting for a while and if stored outside, the electrical contacts need some TLC. Sounds like you are working threw them and sorting out what needs attention.

Keep up the good work.

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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Wed Feb 17, 2021 1:24 pm

Timbox3899 wrote:Good trouble shooting and way to keep at it. Glad that she is running better, maybe you can borrow a sync tool form someone in your area? Might even have a parts store that lends tools out.

With any bike that has been sitting for a while and if stored outside, the electrical contacts need some TLC. Sounds like you are working threw them and sorting out what needs attention.

Keep up the good work.


Hello Timbox :cl:

Thanks for your feedback.

This weekend I will try to make a homemad sync tool. :bg:

I can´t wait to have everything working right and then ride, ride, ride, ride... :bg:
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: Alvega » Mon Feb 22, 2021 3:53 pm

Hello everyone

Weekend update:

A colleague borrowed me a sync tool so I tried to sync my carbs.

I tried real hard but I couldn't find a 100% good balance, the sweet spot was unreachable.

Every time that I was almost almost there (sweet spot) the balance would go far far away.

I left it the most balanced that I could and then went for a ride.

I did about 120Km /75 miles and the bike rides almost fine.
It accelerates well, throttle response is good.

But 7 times out of 10, when I release the throttle it backfires.
It's not a big backfire, it's almost like some soft popcorn. :bg:
Sorry, I don't know how to say it in English.


Do your bikes (in original spec: carbs/exhausts) backfire when releasing the throttle?


Thanks :cl:
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Re: Virago 535 '95 - One cylinder only (Rear) [photos inside

PostAuthor: mark75 » Tue Feb 23, 2021 2:12 pm

popping-back through the carb/air-filter?
or through the exhaust?

sometimes a small air-leak in the exhaust may cause popping through the exhaust.
"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

“THESE are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman.
Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph. What we obtain too cheap, we esteem too lightly: it is dearness only that gives every thing its value.
Heaven knows how to put a proper price upon its goods; and it would be strange indeed if so celestial an article as FREEDOM should not be highly rated”


Thomas Paine --- 1776 December 23


-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
User avatar
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