Oil in my airbox - TwoWheelForum: Motorcycle and Sportbike forums
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 09-24-2004, 10:15 AM Thread Starter
Administrator
 
ShanMan14's Avatar
 
Join Date: Jun 2004
Location: FREE THE HOPS!
Posts: 10,104
Oil in my airbox

I pulled out the air filter on my bike to check it out and see if it needed replacing. As I pulled it out I noticed oil on the bottom of the filter. I looked inside the airbox (carburetored) and say a small pool of oil.

This can't be good? I rejetted the carbs about 2 years ago, but never put on the aftermarket exhaust. I know it runs rich because of that, but why would I see OIL in the airbox? Is this a gasket leak? Can't be good, I'm thinking.
ShanMan14 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 09-24-2004, 02:06 PM
V-Twin Moddin
 
Gas Man's Avatar
 
Join Date: Jul 2004
Location: SE Michigan
Posts: 38,916
I'm not sure about that, I think Larry will be the man for this. However, I've parted out a few bikes in the past and found the same thing in some of those. Of coarse the one with the most oil was a retired suzuki race bike....




-Chris
aka Gas Man



Was: 2002 Kaw ZX-9R
IS:


is me till the
Gas Man is offline  
post #3 of 11 (permalink) Old 09-24-2004, 02:38 PM
 
Join Date: Jul 2004
Posts: 9,263
I wish I had an answer for ya, but I dont know for sure either..a gasket leak would sound logical to me though, since the oil would then be shooting out where the gasket seal should have been secure, and then shooting back up into the airbox...but yeah, I'll just chill till larry signs back on for this one
Need4Speed is offline  
Sponsored Links
Advertisement
 
post #4 of 11 (permalink) Old 09-24-2004, 10:02 PM
 
Join Date: Aug 2004
Posts: 2,394
Had the same problem on my Jeep. Was caused by a clogged PCV valve. On a motorcycle, it could be a clogged, pinched, or disconnected breather hose. Blow-by gases in the crankcase should be routed to the airbox for reburning. The crankcase is already pressurized by the pistons. The worse case scenario is excessive blow-by the rings which exceedes the normal pressure in the crankcase and sends an oil mist to the airbox.
No Worries is offline  
post #5 of 11 (permalink) Old 09-24-2004, 10:57 PM
First 1000 Member
 
Join Date: Jul 2004
Location: Louisville, KY
Posts: 408
Some oil in the airbox is normal. Bikes don't use a PCV valve, they just have a hose direct from the crankcase to the airbox. As your bike's oil heats up and sloshes around it vaporizes. The mist is carried into the airbox where it condenses and coats the inside of the airbox, sometimes enough to puddle a little. Don't worry about it if you can wipe it up easily with a small rag.

Now, if your rings are shot, blow-by will will pressurize the crankcase even more and it forces the oil into the airbox in large quantities. You will know the difference if it happens, it will look like somebody poured oil into the airbox instead of the crankcase where it belongs.

HTH,
Larry

Rarely is the question stupid, but sometimes the answer is you need to run everything you read online through your own personal BS meter to determine if it makes sense to you.
larryg is offline  
post #6 of 11 (permalink) Old 09-24-2004, 11:01 PM
 
Join Date: Aug 2004
Posts: 7,333
And the legand has spoken.
GSXR1000DJ is offline  
post #7 of 11 (permalink) Old 09-25-2004, 12:03 AM
V-Twin Moddin
 
Gas Man's Avatar
 
Join Date: Jul 2004
Location: SE Michigan
Posts: 38,916
Yes he has. Once he said something about the hose, I was like I remember that hose...found it on a few parts bikes.

Larry is the man!




-Chris
aka Gas Man



Was: 2002 Kaw ZX-9R
IS:


is me till the
Gas Man is offline  
post #8 of 11 (permalink) Old 09-25-2004, 09:05 AM
 
Join Date: Jul 2004
Posts: 9,263
I feel like Im am now one, with the oil, the hose, and the airbox ..

Thanks larry, great stuff!!!! im sure Shan is breathing alittle easier bout now..
Need4Speed is offline  
post #9 of 11 (permalink) Old 09-25-2004, 06:18 PM
 
Join Date: Aug 2004
Posts: 3,654
Larry I'll trade you my web services for some motorwork to my race bike I need Yosh cames and heads done. Your the man!!!
twisty is offline  
post #10 of 11 (permalink) Old 09-25-2004, 07:17 PM Thread Starter
Administrator
 
ShanMan14's Avatar
 
Join Date: Jun 2004
Location: FREE THE HOPS!
Posts: 10,104
Thanks, Larry. It was enough to dab up with a rag, no more so I guess I'm okay.
ShanMan14 is offline  
post #11 of 11 (permalink) Old 10-09-2004, 10:41 AM
 
Join Date: Oct 2004
Posts: 6,147
Quote:
Originally Posted by larryg
Some oil in the airbox is normal. Bikes don't use a PCV valve, they just have a hose direct from the crankcase to the airbox. As your bike's oil heats up and sloshes around it vaporizes. The mist is carried into the airbox where it condenses and coats the inside of the airbox, sometimes enough to puddle a little. Don't worry about it if you can wipe it up easily with a small rag.

Now, if your rings are shot, blow-by will will pressurize the crankcase even more and it forces the oil into the airbox in large quantities. You will know the difference if it happens, it will look like somebody poured oil into the airbox instead of the crankcase where it belongs.

HTH,
Larry

Sometimes, at least in my experience, If my oil filter was really dirty or clogged, I experienced the oil mist and pool in my airbox, especially on my old cb 750 k4. I would change the filter and the problem went away
bumblebee is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TwoWheelForum: Motorcycle and Sportbike forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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