The top yoke is just the two pinch bolts on either side. Then it may need just a gentle tap from underneath to get it moving then it just pulls off the forks. If you mean the bottom yoke as well, then you need to undo the steering stem nut (the big one in the biddle of the yoke) and the stem and the bottom yoke will fall through the bottom of the steering head. Be a little carefull here as the steering head bearings have a habit of coming out with it...and they can be in a bit of a state and you can end up with ball bearings everywhere! This is obviously with the forks removed.
You should just be able to remove the current m/s for the clutch and put the new one on if you are carefull, without spilling too much fluid. Then just top it up and bleed it all through with fresh stuff. If its a brembo radial jobbie then you can bleed it at the top as well as the bottom by the slave cylinder.
Didn't bother taking my engine out in the end. I was able to strip everything off it in situ...and after trying to move the bolt without success...didn't see the point in pursuing it further as all I wanted to do is clean it!!!
Its looking sweet now though
[Edited on 3-11-2005 by Harv748]