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:

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

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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

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:

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

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Plough on

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

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946