KXdel,
They are not too hard to replace. The usual way is to remove the clutch so you can pull the shift shaft out. Then it is easy to pop out the old seal with a srewdriver. The quicker method I have done is to lay the bike on it's side, remove the shifter and possibly the CS sprocket guard, then pierce the face of the seal with a sharpened flat screwdriver. You do this on a bit of an angle so that you can lever the seal out using the aluminum around the seal to lever against (gently). It may take a few tries to get the seal all the way out. Then the new seal is lubed up and tapped into place using a washer on the face of the seal (to protect the seal from the pipe) and a pipe over the shift shaft to tap it into place. This is just one way, I am sure other members may have a more "refined" quick method. Hope this helps. Cam.