When the bike is properly heated up, my revs jump up up to +1k while slow riding o_O

It gets normal if i switch to neutral or if i pull my clutch ALL THE WAY (i have to move all my fingers from the grip and pull it 110% in)

Think its a clutch slave cylinder problem (still have the stock one), but i just want to confirm it with you guys...

Did check it, and when i pull clutch lever i can hear swirling air around slave cylinder... But when i remove it to check for leaks, it pumps all the way and stays rather hard on the lever... no leaking or anything (not even that air swirling sound)...

Not sure if i explained this right =/ Hope u understand me...


Thanks in advance...