Do-it-yourself drag calculation
If you know the top speed and the engine speed at that point, and you have a dyno chart, it's easy.
1) Drag is proportional to the square of velocity
2) At top speed, drag is equal to available thrust (pounds) which is torque times overall gear ratio divided by wheel radius (in lb-ft, and ft)
3) You can get the torque from the dyno chart and the tire diameter from the tire specs. After computing the drag you can get a helpful factor for computing drag at any speed by dividing top speed drag by the square of the top speed. For fully faired race replicas this factor is around 0.01 lb/v/v.
A rough estimate of drag at 200 mph for a 600 RR is 200*200*.01, or 2*200, or 400 lb.