I've seen a bit over a ton and a half (160ish) on a 240 kitted Silverback fitted with a Triumph flyscreen.
That was in fourth gear, just getting up onto the cams' sweet spot and pulling hard. So, as the mesmerizing shock and awe set in, my brain sent an override message to my my balls and right wrist and, because I was on a public hwy that was flying by me and appearing to bend space/time, I just dropped the beast into 5th gear to let her and my adrenaline come back down to earth.
It was shocking how much top end was left over for the having!