Gyrobob's graph of horsepower versus speed shows that my Savage was making just over 40hp at the rear wheel when it registered a true 88mph. Bike was stock except for a richer main jet. Stock hp is advertised as ball park 30. This suggests that the CD for the stock bike may be less than 1.0.
Nonetheless, if the graph is more or less correct, then it suggests that reaching 100mph, if possible at all, would take a long stretch of road. At 88mph the front end is feeling light and vague and acceleration is modest, so running a long time with likely increasing instability is not all that enticing. The place to try it would be a track day on a closed track with a long straightaway. But it would be disconcerting to have everyone else screaming past.