Motorcycle wont start ?

Hi,
The motorcycle was idling like normal I went inside to pick up my helmet, then when I got back it just turned off, I Cranked it but no success , I checked spark , it is OK, It just turns on for like just 1-2 cranks and stops again over and over...
Update: I had the carburator at a mechanic he Cleaned it , now when we push start it , it starts and bogs...
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