ok, the clutch is not operated by oil pressure, strickly mechanical from the lever. If your able to spin the splined shaft freely (it will turn some, with very little friction, then start pushing on the clutch rod and stop), something isnt installed right. when that shaft is turned, the rack portion moves to push the clutch rod (long rod sticking out in pic 1) which in turn pushes on the pressure plate to release the clutch.
when the spined shaft rotates, it should be moving that 6 toothed rack in and out. (in towards transmission releases the clutch).
when I had my front bevel off the bike, I didnt need to disassemble any of it. I left the clutch rod in place and didnt mess with the splined shaft or the 6 tooth 'gear' at all.
by running at full speed whether or not the clutch is in or out, are you referring to engine speed? or rear wheel speed? Also, unless there is some friction or drag on the rear wheel, even with clutch fully disengaged, you will get some rotation (nature of our wet clutch)