Believe it or not, it's up to you. The warrior engine is quite capable of reaching 68mph. It doesn't get there very quick mind you, but it will go there. The conditions of the speed were:

going on night time, approximately 2.5km run, hard packed dirt road, around 8°C and a very slight down grade. So slight that if you were stopped and pulled in your clutch, you'd have to push with your feet to get it rolling. The bike setup was the same as you see in my sig, only with the stock gearing at 13/40. 13/40 and 22" tires in 6th gear on a Warrior is probably good for just over 70mph, but the bike just doesn't have the power to pull that speed.

Anyhoo, like I said, you can believe it or not, it's up to you. I was there .. were you?