Background: 1999 YZ 400F Ran bike last Sat. (ran great) for 3hrs. Started raining, bike sat until it stopped. When it stopped raining I got the bright Idea to go play in the mud. 5 mins into the ride, the bike starts studdering and lerching and having some serious bogging issues. Got so bad that the bike wouldn't even take off from a stand still (would start though very easily). Got it back to camp and It sat for the remainder of the weekend. What I have eliminated I think: Drained about half a gallon of fuel out of the tank thinking water somehow got into the tank. ran it up and down my road for a couple laps and a serious bog issue is still very apparent. I'm thinking water in fuel not the issue? Problems I am considering: Clogged jet/ needle? Bad throttle pos. sensor (if it has one, no Idea)? CDI unit? Please help with any other problems you all might think may help me solve this grand mystery. I feel the bike had plenty of time to dry out before the run through my neighborhood 2 days ago. Could it be just an electrical connection some where? Help Please!!!!