If you wanna run a 'shee, a nice start would be:
Set of gnarlies or a 2-1 pipe, 2-1 carb setup,nerfs, woods port, set of triple rate works, razr2's all the way around, steering stabilizer, belly full of skids, -2swingarm and a set of handgaurds.
Yfz450: handguards, pipe, razr2's all around, skids, nerfs, steering stabilizer and a thicker seat. You'd prolly have to loosen the shocks up some so it don't bust the teeth outa your head.
400ex, raptor, or z400:
Handguards, skids, razr2's, nerfs, Gas and go..... but you'd be slow.
Mike