Try the simplest thing first - the idle screw adjustment. My guess is that as the engine has broken-in and become a little more free revving, the idle speed has increased and is now engaging the clutch. Just back it off 1/8th off a turn at a time.
Taking the clutch apart first might get you into a whole load of confusion! As mentioned already, if the clutch is jammed then the bell won't spin freely by hand (with the engine stopped).
EDIT: Did you adjust the mixture during run in? It could also be that you have gone a bit lean by mistake and that will increase revs at idle too.
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