ok so i have a kdx 250 and the thing has been riding like a monster forever, recently the bike died out on me, and when i tryed to start the bike up again and the kickstart wasnt catching it was just flying down, also prior to it dying the bike started fouling out spark plugs like every hour or 2 that day. so the gears in the kickstart werent meeting so i replaced all of that and once i replaced and reassembled it the motor just wouldnt turn. but i did get the bike to pop start but once it was started it sounded like it was hungry for gas. i took the carb off and cleaned the whole thing out, cleaned the air filter and i get on the bike and try to start it and i get nothing, so i kept trying untill my foot felt like it was gunna fall off and it sounded like the engine was just about to turn when it sounded like air shot out of the front of my bike and it sounded like a gunshot out of my exhaust. any clues on the damage? since im a mechanically clueless.