I haven't kept up well with this discussion group, and I see your post is two months old. Everything Grant told you is true, however I've been told that tapping in the seals themselves a little bit (as opposed to tapping in the collar, which in the newer models is brazed to the pushrod tube)well stop the weeping for a while. Letting them weep won't hurt anything, but is a little messy. I recently installed new ones, and it is about a half a days job, if you take the time to decoke your heads and pistons, etc.
You can shorten the job by only removing the cylinder far enough to replace the seals. This way you don't have to mess with the piston rings and stuff.
Bob Shilling, Berkeley, California
\'88 BMW R100GS, \'91 BMW R100