hi i just bought a 93 rmx 250 for 400 the guy i bought it from had absolutely no time to fix. So anyways iput fresh gas and oil in it and it would not start. I pulled the carb off and cleaned the jets then i noticed the float was stuck. The carb was terrible and the whole bottom of the gas tank had some sort of dirt in it. i flushed the tank out and it is now clean i put the carb back on and started it. it fired up but the float got stuck which caused the bike to rev up on its own. it sounded like gave it full throttle and iwasnt even touching the throttle then for some reason it would not shut off. it idols sometimes but then it starts to rev up on its own after idolsing for a few minutes and when it revs up it spits out gas out of the fuel line and carb and at that point it wont shut off so ihave to let it die out on its own. what could be the problem ? should i just get a new carb for it?