ok, this is what I do: before you put the clutch on the engine, back out all the set screws just until they start to bind. They are installed in a way to where the screws cannot come out completely. you'll notice slop between all the parts and the shoes flop about easy. tighten the screws only until the slop is gone. now the clutch is at zero. next, tighten the screws X amount of turns further to set preload. I like the feel staggered preload gives, ex: 1.5,2.0,2.5 turns. adjust from there for the track and how aggressive or smooth you want the clutch to feel. Also, it helps to put some sort of a mark on your 1.5mm driver to count rotations.