As suggested from fabiostar, the right hand side
could be clutch area, or water pump. (see quick tip below for how to listen
inside the engine)
Does the noise REALLY go away at 140kph, or is it just that you can't hear it due to the wind and engine noise?
Take the bike up to 50mph, and then pull in the clutch lever. Does the noise go away?
If the noise is still there, again, take the bike to 50mph (80Kph), pull in the clutch, and put the bike into NEUTRAL*** Effectively coasting and NOT using the clutch.
*** DO NOT BANG THE BIKE BACK INTO GEAR after this, but rather coast to the side of the road -THEN pull away again. (You don't want to damage the gearbox chunking the bike back into gear at that speed, or risk knackering the cam chain tensioner)
As it's a whirring noise, that doesn't always mean it's something spinning. It could be something moving at high frequency, or something " frantically rubbing" giving the sound effect that it's "whirring".
Check there is no fault in the fan, and that it's clear of stones (I had a small stone in mine after they re-chipped the road, and when the fan kicked in, an almighty clatter started!)
Also have a quick look in the coolant bottle. Is there any fluid in there? Is it clean coolant, or maybe there's crud in the hoses/system, slowing the pump/impellor down. Could be the pump seal. Remove water pump bolts (one at a time) and see if they are dry on removal. If they are rusty, you have a leak. You'll have to remove the right fairing panel, as it won't bend far enough to get the long pump bolt out)
Is the clutch push rod and seal ok? This rod goes all the way through from the clutch cylinder on the left side of the bike (in front of sprocket cover),
You said it makes this noise when you made the video. Was the bike moving, or just running / ticking over on the driveway?
Quick tip:
Pop the bike up on a paddock stand (get the bike upright)
Get a long n' large screwdriver (a flat head), and when the bike is running (upright), touch the blade end of the screwdriver to each engine casing in different areas (clutch and water-pump), and put the handle of the screwdriver in your ear (nice and snug) and you will be amazed at what you can hear through it.
It will act as a stethoscope, and you almost hear every wheel and cog turn, the piston rings, the crank, the clutch and the water pump (depending on which part of the engine you touch the screwdriver end to).
If buying a bike, I always listen to the inside of an engine with me trusty screwdriver. And it's a good tool to use for problems like yours to try and pin-point where the noise is coming from. The louder the noise is located, that's usually the component that's producing it. But it can "bounce" through other areas to still throw you off course. Give it a go, have a listen and see what you think.....
