While I do not have the torque spec on the clutch, you're going to want to be very gentle. Many a clutch basket has been ruined by over-tightening the cluch bolts, as it snaps off the basket tower. I use a 10mm T-handle, and just snug down as I would the case bolts when I split the case. Never had one back out yer. I am sure the torque is light. Paul probably has the spec.
Use Extreme Caution.
Rick