Crankcase breather on XT660R
 

Hi!
I've had an XT660R for almost 2 years now. After last oil change, some oil got into my air filter housing. Since I have a 2-in-1 collector pipe running from under my air filter housing, some oil gets from between the air filter housing cover straight on my collector pipe so it means a lot of smoke when standing with engine running. I got a bit deeper into that problem.

Yamaha centre said, that it is normal, that this tube fills up from time to time and I just have to empty it. There even is a small reservoir for excess oil that it wouldnt leak into air filter housing. Well it is weird that it took 15000km for this to happen, i havent touched the tube yet so I still get some oil leak to my air filter. I hope I dont have excess pressure in my engine :P that would be a bigger problem.

Ok now to the point

- Is the tube sucking air FROM the airbox or TO the airbox?
- Can I disconnect the tube from the airbox and reroute it somewhere else, using maybe a cone-filter or a foam filter in the end of it.
- Can I put a one-way valve in the tube so the air would move only in one direction and the oil wouldnt move in another?

What else can I do to make things better? I am sometimes doing something like this, i dont want the modifications to affect my fun:

http://www.hot.ee/piipz/deepwater.JPG

:wow: I hope that has not got a stage 2 air filter on it!!!

Well, rerouted the breather, used a new hose with a special breather filter.
It is on top of my radiator now, cut a Coke bottle in half and used it as a "hood", so the filter wont get wet too fast.
I think it is actually a bit higher than the top of the air filter snorkel, so I removed the middle chamber that was supposed to collect the excess oil.
There is no way the oil reaches this high except for maybe when I fall. And this time my air filter stays clean :)

http://www.hot.ee/piipz/DSC00006.jpg

Forgot to take a picture of the breather filter before I installed it, but found one on the internet, it looks almost exactly like mine:

http://www.roadraceengineering.com/i...lledonhose.jpg

Good work. Ive done1 or2 water crossings like that and it can be a bit hairy afterwards thinking is everything still runnning ok:016:

I would be more worried about sucking in water through the motor, then the breather.

what do you mean Kev by "through the motor"? You mean air filter?

Looking at the depth of the water I would be worried that the water will enter the motor thought the air filter & damage the motor.

oh ok :) well the underseat was still dry. but it was pretty close :)