Nathan I have read your story here and it sounds like you need a magneto coil or a cdi, you said you were riding in mud and probably got the coil wet . The link below is both.
http://www.ebay.com/itm/CDI-Ignitio...Parts_Accessories&hash=item565cf5887a&vxp=mtr
http://www.ebay.com/itm/CDI-Ignitio...Parts_Accessories&hash=item565cf5887a&vxp=mtr