IF the bike if all original and in perfect shape, you should get well over $2000 for it.
This bike here would be considered NOT all original and is over 2000.
http://cgi.ebay.com/ebaymotors/74-Honda-CB550-Four-K0-5-941-Orig-Miles-Beautiful_W0QQitemZ290409443683QQcmdZViewItemQQptZUS_motorcycles?hash=item439dc07163Take GOOD pics of it. NO cellphone pics. Make sure they are high resolution. Get pics of the VINs, the Odo, AND the tires. Then get good side profile that covers wheel to wheel. AND MAKE DOUBLE SURE to get good ones of the exhaust. The exhaust alone to restorers would be worth well over 1000.
The people looking for a bike like this are going to expect exacty what you say. If you say the bike is all original, then in their minds, "by god it had better be, right down to the tires". they will pick at ANY detail to try and get the price down.
Some people are anal about their "original" bikes.
The ride IS the adventure. The destination is just to get gas!