Okay so a little background.

Last race of 2010, I went out for the 2nd practice session of the morning and my bike would not accelerate. It felt like my clutch was TOAST. Came in thinking I was screwed, but then I explained the symptoms to Louis Ortiz and his dad said I needed to adjust the slipper clutch.

Long story short, we took the clutch cover off, adjusted the screw on the slipper so it slipped "less" I think, and the bike was fine for the races. Actually felt more powerful than it did for half the season.

1. What exactly is the problem with the slipper? And why did it happen so "all of a sudden"?
2. We checked the clutch plates and they looked fine. Do I need new clutch plates?
3. Is this something that I need to adjust often?