As some of you may know, I'm trying to recommission a 1990 kick start DR650. Well after struggling to get it running, without breaking my leg, I've now got a problem with the clutch. It runs fine, but the clutch will not disengage, so as soon as you drop it into gear, it tries to spin the back wheel and stalls. When I had it apart to repair the kick start mechanism, I noticed the fingers on the clutch "pressure disc" had been glued together after some previous damage, so I got a spare engine and replaced the whole clutch unit after getting it running and having this problem. Today I pulled it apart again, and cant see anything wrong- there's the right number of friction and intermediate plates & they're arranged correctly. With the clutch basket off, you can turn the rear wheel (with it in gear) and it doesnt move the piston. With the basket bolted on, but no friction plates, it's still free. As soon as the friction plates are fitted and the centre nut is tightened (the picture below is this stage) it locks up. If I slacken the centre nut slightly, all is loose again. Anyone got any ideas what I'm not seeing?