hi i owned a kawasaki kmx 125 that runs great before but later as ride the bike for more than 5 kilometers the engine just die i dont think if its overheating coz if i fire it again it will start easily,the problem keeps on coming back if i ride it again,ive already checked the fuel level from the carb but its in a perfect level,what could be the problem,please can you help me and also is there anything more i can do to make it a little more faster?