Originally Posted by signupdamnit

Unless the position is bringing you thousands of quality hits per day you have little to lose and much to gain depending on the term. Try making small changes and keep track of which direction the changes send you. I wouldn't stop updating unless you got magical first page positions on great terms on a small site with few back links. In all other situations updating is usually the better option. If the site got there on back links and relevant content an update shouldn't hurt much if at all.