Drain the oil, remove the clutch plates, remove the large nut in the middle of the clutch (you'll need a tool to hold the clutch still or a rattle gun to zip it off).
Remove the clutch basket, it just pulls off.
Undo the 6 bolts holding the outer clutch. Remove the outer clutch. It just pulls off.
Remove the bolts holding the little plastic hose connector to the crank case, remove all the bolts holding the clutch cover on.
Give the cover a few gentle taps with a rubber mallet and it'll come off.

At some time in this operation the clutch push rod and/or the bearing that sits between the rod and the cap may come out. That little bearing has a habit of vanishing. Watch out for it.

Replacement is just a reversal of removal, be carefull with the outer basket, it has a hole that lines up with a peg on the primary (or vice versa) and can only go back on one way, you'll either crack it or it'll not sit straight if you tighten it up alligned wrongly, don't ask how I know.

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