Thanks for the amusing read mate, been there done that, my XJ is the 750 version and it has had a rattly clutch since I got it, rebuilt it twice now and it still makes horrible noises and has yet to actually break or let me down, if I were you I would just ride it and forget about the rattle/rumble as even if you fiddle with it for a month it will still rattle. Tried all sorts of fixes and can't for the life of me see what makes the thing actually make the noise, tho I suspect it is the plates in the basket making the thing rumble/rattle but above 15 hundred RPM it quiets down and works fine, it's just the way it is.