On loan from MX-Tech website
Headshake:
Adjust the forks lower in the triple clamps.
Excessive rear end kick:
Check for packing, which is identified by kick to side in hard to loam conditions. If you observe packing, soften rebound. (Turn clicker out.) This cannot be avoided if you brake improperly and lock the rear wheel up and/or pull in the clutch, on the entrance to corners.
Keep a record of the different settings if you race different tracks. That way you can start at a point that worked well the previous times.