The second you hit the big mud you'll lose speed, which is why you must stay on the throttle. Don't shift down or dump the clutch as this digs you into the mud.
Stay loose & let the bike traverse side to side as it hunts though the ruts. Stay on the gas, stay on the gas always!
MAX MUMBLES says: "If the front wheel plows in, you may crash, but if you can keep the front end light, you'll be all right."