I have an 04 wr 450 and I went to install a JD jet kit and when I pulled the bottom off there was a large amount of mud right near the hole for the drain. Yesterday we went riding in wet and muddy conditions. The bike stalled a couple of times in wet mud. I had a real hard time getting it started and keeping it running. I pulled the filters out of the gas tank and they are totally clean. How can mud get into the carb? My air filter was fine also. Cheers S.