Extreme pressure inside of my motor

On the right hand side of the motor, top/rear, there is a hose attached to the motor case with a small clamp. That is the crankcase breather hose. It goes into the airbox where it connects to a plastic filter holder... that butts up against the foam air filter. Take that entire hose & plastic assembly off from the bike and clean it out. Replace the tiny foam filter inside the plastic holder. Remove the plastic drain from the airbox and clean the airbox out good. Clean & reoil the foam air filter (or replace with new & oil it lightly). Reassemble. You can find a copy of the service manual for your bike linked in THIS THREAD.