Around 150 kph, I think, which would be about 93 mph. That was testing the bike out when I first got it.
Been up to 140 kph while passing folks on the highway more than enough times since then, but that's about it. More than fast enough for my terrible eyeballs. Course the speedo on mine seems to be about 5 kph high (which is quite a bit!), but I'm taking that into account.