Oil in the air breather.. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

 7Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 47 (permalink) Old 08-01-2017, 11:28 PM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Upstate NY
Posts: 18
iTrader: (0)
 
Oil in the air breather..

OK so I just Bought my bike yesterday . it's a 86 Vulcan 750. When I got it home and jumped the battery the bike turned over really slow and back fired After reading some threads on this site I was relieved to find out it was most likely do to the battery being bad so I bought a new battery for her and walla she fired up, but after running for about ten minute's she quit and wouldn't start up again. I got her running again today and noticed she was smoking white smoke out both exhaust pipes. Smells like it's running rich, don't smell like oil or anti freeze. She didn't quit on me today but as she warned up to normal operating temp I noticed I'll coming out of the breather case I pulled the cover and it was flooded with oil. I did some reading on here and I see that it could be that it's over full on oil so I'll be checking that after work tomorrow, my question is, is could the smoke be from it sucking oil up thru the air breather, and mixing with the gas in the carbs.... Any help would be appreciated. Thanks
Jdjb021970 is offline  
Sponsored Links
Advertisement
 
post #2 of 47 (permalink) Old 08-01-2017, 11:33 PM
FREEBIRDS MC CENTRAL NY
 
OleDirtyDoc's Avatar
 
Join Date: May 2011
Location: Norwich,NY
Posts: 15,873
iTrader: (0)
     
Garage
Send a message via Yahoo to OleDirtyDoc
yup over full oil will make it smoke.check your oil for a gas smell,as you may be flooding

Sent from my LGL34C using Tapatalk

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
OleDirtyDoc is offline  
post #3 of 47 (permalink) Old 08-02-2017, 03:45 AM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 986
iTrader: (0)
 
Garage
OldDirtyDoc makes a great point about checking for a gasoline leak as the cause of the high oil level. Definitely want to get the carb and/or petcock fixed. Hopefully the PO was just really bad at measuring.
Also, "Voila".
TheJabberWoggy likes this.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is online now  
 
post #4 of 47 (permalink) Old 08-02-2017, 12:13 PM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Upstate NY
Posts: 18
iTrader: (0)
 
Thanks guys I'll definitely check that tonight when I get home if the oil smells like gas would that be from flooding the carbs or is there something else more serious going on?
Jdjb021970 is offline  
post #5 of 47 (permalink) Old 08-02-2017, 01:26 PM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 986
iTrader: (0)
 
Garage
Likely culprit would be a stuck carb float causing flooding.
One1 likes this.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is online now  
post #6 of 47 (permalink) Old 08-02-2017, 02:54 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,458
iTrader: (5)
   
Or leaking through the petcock vacuum line.
One1 likes this.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #7 of 47 (permalink) Old 08-02-2017, 05:53 PM
I'm a rider
 
One1's Avatar
 
Join Date: May 2014
Location: Signal Mountain, TN
Posts: 764
iTrader: (0)
 
Garage
Agree with everyone above. A leaking petcock seal, or float valve needle will fill the crankcase with gas and cause blowback through the crankcase vent into the airbox. To be that overfilled it's unlikely that he overfilled it very likely the crankcase is flooded with gas. You can't drive it that way obviously with no lubrication, but worse the stator will get hotter and its already an issue to begin with. Drain the oil before you crank it again and check it for gas. I just went through this with my kawasaki KLX and had to rebuild the carb and petcock.


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
One1 is offline  
post #8 of 47 (permalink) Old 08-02-2017, 06:21 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,458
iTrader: (5)
   
When mine did it, the shifter started feeling sticky after it got good and warmed up.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #9 of 47 (permalink) Old 08-04-2017, 10:37 PM Thread Starter
Junior Member
 
Join Date: Aug 2017
Location: Upstate NY
Posts: 18
iTrader: (0)
 
OK so I checked the oil it was over full I drained it down till it was half way up the check window. I thought my problem was solved, when I started it it didn't smoke I let it warm up and when I brought the idle to around to 2000 rpm, and it started smoking again and pouring oil out the left side air breather again. The oil does have a trace of gasoline smell to it but not like the oil is flooded with gas. What would make the oil come out of the air breather if the oil level is normal. I'm sure the smoking is because the oil is being pulled thru carbs and being burned. Like i said it didn't start smoking again until I brought the rpms up to around 2000 and that's when the oil started coming out the air breather again.. Thanks for all your help.
Jdjb021970 is offline  
post #10 of 47 (permalink) Old 08-04-2017, 10:52 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,458
iTrader: (5)
   
I would pull the crankcase breather hose loose and see if there's a lot of positive pressure from the crankcase, at idle and revving.

Sounds like there might be a burned or broken piston/broken rings. If it's pushing oil out of the crankcase breather, it's terminal.

Does it seem to be running on one cylinder?

Otherwise, .. Raw gas getting into the pipes can cause white smoke, but it will smell like gas and not burned oil.

Gassy smelling oil has gas in it. It shouldn't be there.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome