Hi Guys,
Today i replaced my spark plug in front cylinder for new one and when the airbox was taken off i started the bike to check is everything is fine. After a while i noticed smoke from front cylinder breather hose. Please check the video:

https://www.youtube.com/watch?v=uavNnjmk6zk

What do You think? Is this some serious issue with the engine?

Thx, regards.