i have a 2003 klx300. the bike starts normal but when i give it throttle it will sometimes bog down then start to rev up, other times it will bog down and die. Could it be that it is low on oil pressure, or needs an oil change. any information would be good as to my bikes problems. i bought the bike used so i do not know if the previous owner did anything to it the carb. it used to run fine. i took it for a ride and nothing was wrong. then the next time i tried to ride it this happened.