Please don't take this comment as mean---this sounds like "Around the world in 80 days."
We spent three weeks in Rushmore/Black Hills/Yellowstone/Cody/Rapid City alone. We don't ride motors, but the Black Hills offer some of the best riding in the U.S. (In Custer, SD. don't miss the Purple Place for the best pie ever).
Yellowstone offers the two lane roads akin to a park, complete with buffalo walking down the roads holding up traffic. Actually, the term walking should be moseying. A day might be used up getting from one end to the other with no real sightseeing.
We didn't waste to much time at each place. The itinerary you are proposing is pretty ambitious.