whats wrong with my poor kawasaki klx125?

i just got a 2003 or 2004 kawasaki klx 125 from a friend who could never get it running right. he said it popped when he rode it then one day it just wouldnt start. i checked the plug and its sparking and its gettin gas.....what else could it be plz help
it also makes a whoosing sound when i kick it
 
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