You are always taking some risks allowing someone to ride off on your bike (but it could seal the deal for you).
If a buddy has a bike you can borrow, you could ride along with the prospective buyer. Tell the buyer you just love to ride and you'll tag along. That would look better than 'tailing' him in your car like a vulture, and you could answer questions during the ride, as well as make sure he doesn't pop wheelies, drop, or ride away with the bike, etc.
As for the documentation, sounds like you know what you want. You could search Google for a template but it may be hard to find one specifically written for a motorcycle.
Use your word processing software to draft your own (notepad is sufficient). It doesn't have to be fancy, just clearly listing all the items you mentioned. You'll usually be able to tell in the first few moments of talking with someone if you're likely to even need the document or not.
Or, you could avoid all this... put the bike out in the driveway. Set up a large fan in front of it. Record about 30 seconds of revving the engine, hitting the horn, etc. When a buyer shows up and asks to try it out, have him sit on it, turn on the fan and play back the recording.