I am thinking about buying a 550 seca that needs some work. The ad for it states that it needs a new clutch. Can anyone tell me about how much it would cost for a new clutch assembly and how easy/difficult it might be to find one for this bike? Any help would be much appreciated.

Finding the clutch parts is as easy as going to http://www.bikebandit.com , look up the parts on their online microfiche, and order them. Might want to call to order to make sure if the frictions and steels are sold in groups or in a complete set that the bike needs. I just looked them up and saw the parts listed as available for it, but don't know if the price's listed are for a single disk, or all of them.