| Have you checked to see if the coolant level is dropping?
Need to have the bike upright to check it.
Also worth a look in the oil level window to check if the oil is emulsifying, sure sign off a problem if both symptoms are together.
Mine was blown head gaskets when mine was doing a similar thing?
Get the fairings off and see if there is any coolant leaking anywhere, if not you might have a gasket problem?
Other thing could be a split header tank which has happened to a few members before.
Nelly at Cornerspeed did mine in double quick time so I could get to Assen last year.
Worth a call to him on 01623 758877 | 
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