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Engine and white smoke

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Engine and white smoke

PostAuthor: scottfree » Sat Aug 12, 2017 7:13 am

Hi

I've just purchased a 1973 Virago. The bike has 20,000 miles on the clock. The problem with the bike is the front cylinder is producing white smoke. The compression on both cylinders at idle is 125 psi and when reved 150psi.
What would be causing this? Could it be valves not seating properly, warn out piston rings or the carburettor mixture?

Please help!

Many Thanks
Scotty

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Re: Engine and white smoke

PostAuthor: bstig60 » Sat Aug 12, 2017 1:58 pm

Stuck float or leaking petcock and the crankcase is full of gasoline. The back pressure then forces the mixture out the vent tube into the carb and it collects in the muffler and smokes when it gets hot..... Change the oil and filter before you run the engine or you run the risk of destroying rod bearings. Locate the cause and repair before riding. A leaking Petcock when it is on ON will cause this, so will running the bike on PRIME or a stuck float or leaking needle valve.
You are checking compression with the engine running??? A very bad idea!
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Re: Engine and white smoke

PostAuthor: Jake » Sat Aug 12, 2017 2:10 pm

" 1973 " ? ? ?
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Re: Engine and white smoke

PostAuthor: Falcon1 » Sat Aug 12, 2017 2:17 pm

Just bought a 1973 Virago?

Man, that's some good trick.

LOL, I see Jake beat me to it...
1996 XV1100S
1994 XV535 (Wife's, she wants a bigger one, size *does* matter to her.)
:usa:

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Re: Engine and white smoke

PostAuthor: mark75 » Sat Aug 12, 2017 6:21 pm

Howdy Scotty. Welcome to VTF.

hydrocarbon 'smoke' is usually blue or black, while 'lighter' compounds, like water, are seen usually as white or light grey.

particularly if the engine has not run in awhile, it could easily be water condensation.

you can test ring/valve condition with a "leak-down" test. that result will give indications of their condition.

I would do the "Seafoam Trick" first [with or without the Seafoam] or at least ride briskly for a continuous hour to be sure the systems are purged of any moisture.

my question would be [particularly if she is in OEM configuration, exhaust-wise which has a pumpkin (balancer) involved] how are you certain of a smoking front cylinder?
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Re: Engine and white smoke

PostAuthor: scottfree » Sun Aug 13, 2017 5:58 am

Hi
Thanks for your welcome and your replies.
I established it was the front cylinder by using a faulty spark plug, firing the bike up and then switching cylinders.
Also there seems to be excess fuel coming out of the bleed nipple on the right hand exhaust system.
Is this a result of a sticking float as suggested ?

cheers Scotty

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Re: Engine and white smoke

PostAuthor: Jake » Sun Aug 13, 2017 6:26 am

Please edit your profile to reflect the proper year of your 920. Viragos were not manufactured before 1981.
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Re: Engine and white smoke

PostAuthor: Flyingdog » Sun Aug 13, 2017 6:34 am

Falcon1 wrote:Just bought a 1973 Virago?

Man, that's some good trick.

LOL, I see Jake beat me to it...


Yea...I saw that too.... :worthless: "Purdy Please"
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Re: Engine and white smoke

PostAuthor: scottfree » Sun Aug 13, 2017 12:29 pm

haha ,sorry i made a typo 1983 920 xv .

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Re: Engine and white smoke

PostAuthor: Jake » Sun Aug 13, 2017 1:08 pm

scottfree wrote:haha ,sorry i made a typo 1983 920 xv .


I understand typos are made, will you please change the year on your profile ?
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Re: Engine and white smoke

PostAuthor: Flyingdog » Sun Aug 13, 2017 1:58 pm

scottfree wrote:haha ,sorry i made a typo 1983 920 xv .


:woot: Finally...I know I will sleep a whole better. :thanks:
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Re: Engine and white smoke

PostAuthor: mark75 » Sun Aug 13, 2017 3:49 pm

bstig60 wrote:Stuck float or leaking petcock and the crankcase is full of gasoline. The back pressure then forces the mixture out the vent tube into the carb and it collects in the muffler and smokes when it gets hot..... Change the oil and filter before you run the engine or you run the risk of destroying rod bearings. Locate the cause and repair before riding. A leaking Petcock when it is on ON will cause this, so will running the bike on PRIME or a stuck float or leaking needle valve.
You are checking compression with the engine running??? A very bad idea!



:yup:

stuck or incorrect float level - possibly changed by accidental impact :con:
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.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride" ... E.A. Poe

'13 - FXDC Super Glide Custom
'82 - XV750

Time flies whether you're having fun :yahoo: ... or not ... :fan:
And ---
Any day above ground is a good day. so Laissez les bon temps roulez ...
just roll safely

"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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