Oily Fluid In Air Box

JoeC · Post by **JoeC** » Tue Jul 24, 2007 10:00 am

Doing my first service on my 11S and there was a lot of oily fluid that needed draining out of the right hand side of the air box. I have read something somewhere saying that fluid is normal (?) and to drain regularly.

What is the fluid?
Where does it come from? I use K&N filter
Is it a problem?
Should I be worrying apart from doing the occassional drain?

Cheers

johnl · Post by **johnl** » Tue Jul 24, 2007 10:48 am

I believe it to be oil from over filling the engine that gets sent up to the air box. It can easily be drained just by removing the plug. It may be worth checking and cleaning the air filter. I do not believe it is anything to worry about.

POB · Post by **POB** » Tue Jul 24, 2007 1:38 pm

Water can also be sucked into the inlet duct (through the front), and this mixes with oil "misted" from the crankcase breather.

Not unusual, and if you leave it you just get a nasty yellowish dribble down the RHS of your gearbox / clutch casing. When I broke the drain plug off mine (long and irritating story) there was about 1/4 pint in there!

Boxadog 2000 · Post by **Boxadog 2000** » Tue Jul 24, 2007 7:01 pm

It's not oil from over filling.

As said its oil vapour that comes from the crank case breather and a bit of moisture sucked in from the snorkel.

Just drain on a regular basis Ie ever 2 or 3 thousand miles.

Bob