Oil residues inside air filter box

[Faber32]

Hi everyone. Today I found a good amount of oil build up inside air filter box, and inside the throttle.
It never happened before. Do you think that short trips could cause this?
Or a bad valve adjustment? A mechanic told me he did it last year....

Thanks for help

[Ruffus]

You sure this is not a beehive?😉

Has to be cleaned properly without pushing too much of this gunk inside you injection. I would use paper towels and a strong vacuum cleaner simultanousely.

This oil could be from your gear (overfilled once) or your "puke tube", which leads from your airbox down under your motor (has a plug in its end) is full of a water/oil mix.

[Faber32]

I think it's engine oil because I use Motul (red, like the buildup). Gear oil is yellow and I never overfilled it, but I'll keep an eye on it. Thanks Ruffus :-)

[blaudp79]

I'm having the same issue on my 2012 People Gt 200i 60k kms (37k miles). I've noticed the oil inside the airbox, behind the filter and it actually burns oil. The oil level goes down from max to min in about 2,500 to 3,000kms. I have always replaced the oil and the oil filter at every 5,000 kms.  There is an oil separator bult into the airbox. Hot oil vapors from the valve cover go through there and it should separate the oil which then should go down into the drain tube. The drain tube should be emptied at every oil change. I do see oil in the drain tube and I do purge it, but what if the separation doesn't work properly... That would explain both the oil burning and the the oil layer behind the air filter. I'm thinking of removing the airbox and look inside the separator (if I can remove it from the airbox).