When was the last time you adjusted the valves?
I heard that an indication of cam bearing wear was unequal adjustment of the valves between left and right.
Otherwise, check for loose screws. The squeaks can manifest as very strange sounds. I have intermitant squeaky headlight and speedo. A new squeak appears every now and then. Grab headlight squeak goes away. Another time its the speedo. And they sound different most of the time.
And if you've never looked at it...
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1191167029