Older bikes didn't have the electric restrictions. So going past the redline on those, could possibly blow the motor. These bikes will cut you off at a certain point.
Read new, they limit the bike to 6.5k and are supposed to remove that restriction after the first maintenance
With my Woolich tune my top speed restriction was eliminated and my RPMs were raised to 7.5 but there’s no reason to ever go that high. Look at the red lines on this dyno graph of my bike. The tq numbers. I shift at 5.5-6 on the dragstrip. Well, when I’m paying attention.