I had the IT tapped out in 6th gear a couple of times, that's somewhere in the vicinity of 140km/h (as confirmed by a mate, who has a working speedo, riding alongside down a fenceline track at home). Doing that sort of speed right next to a fence is pucker-inducing, to say the least
Brilliant weekend, it was more than worth the 10hr round trip in the old farm ute.