Originally Posted by KEELAYMONSTER
My 950 did the same. Found mine was due to a balancer shaft seal failure. The case breather port is right above this seal. Its very easy to check and replace. Just make sure you have a spare ignition cover gasket.
This, it's easy to change. Gasket is $25, and the seal is $10 or something.
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KTM 525 XC-W // KTM 950 Adventure