These seals are doable,without cracking the case.

[Ronin]

For future reference the drive shaft seal,the clutch push rod seal next to it and the gear shifter seal below it.Are doable from the outside without cracking the case.
I saw a few topics with this in question.The drive shaft seal isn't to bad,the clutch push rod seal is a snap and the gear shifter seal is a royal pain in A$$ to get out.Ended up using very small screwdrivers to chip away enough of the hard rubber shell.Then prying ever so carefully...

I did find a black widow that made her home in the upper drive shaft case .I'm painting the bike black with red.So I guess it's fitting.

For Pete's sake be careful out there people!

[Kurlon]

Reviving this... the parts fiche shows two seals on the output shaft?  Any reason to muck with the inner seal?

[Ronin]

Now that I remember...that isn't two seals.Just an metal piece and the rubber seal,both in One.it's mounted onto the back of the seal as I remember it right out of the pack.I had just a few drops of oil until the new seal was heated to running temp.No leaks now.