Thread: Gas in Oil
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Old July 1st, 2011, 05:48 PM   #1
Buffalony
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Name: Joe
Location: Buffalo NY
Join Date: Jan 2009

Motorcycle(s): 08 Ninja 250 "Wasabi", 82 Yamaha xj650j

Posts: A lot.
Gas in Oil

So I had this problem come up in another thread and another member is having the same issue.
http://www.ninjette.org/forums/showthread.php?t=77854


I'm trying to narrow down the source of the gasoline.

I've come up with a few possibilities, but had some questions about something interesting I've just come across in the service manual.

Back ground.

Not too long ago I posted a question up about my air filter smelling like gas.
http://www.ninjette.org/forums/showthread.php?t=60805

All was good and left it alone.
Today I pulled the filter and noticed it had quite a bit of oil on it this time.
later I was going through the service manual and noticed on page 99 Section 3-25, that there is an oil drain plug at the bottom of the air box, left side of bike! Never knew of this one

I did know that there is a crank case ventilation tube that connects to the bottom of the airbox from the top of the crankcase so crankcase vapors can be burned of in combustion.

My question comes from not being able to see how these tubes are positioned with respect to each other.
I'm wondering if because my oil drain in the bottom of the air box is likely full, is it possible for any fuel introduced into the airbox for whatever reason could be floating on top of that oil and down through the crankcase vent tube into the case contaminating my oil?

A reply from anyone who knows the inside and bottom of these boxes would be greatly appreciated. TIA
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