Other Bike starts then dies

My wife has a 2015 ssr125cc pit bike. Haven't rode it in awhile,so I tried starting it today and it took me quite some time to get it turned over. So it started then ran for 5 seconds and died. It is taking longer and longer to get it turned over but won't stay running. Any help is appreciated since I don't know crap about bikes.
 
My wife has a 2015 ssr125cc pit bike. Haven't rode it in awhile,so I tried starting it today and it took me quite some time to get it turned over. So it started then ran for 5 seconds and died. It is taking longer and longer to get it turned over but won't stay running. Any help is appreciated since I don't know crap about bikes.
Sounds like a fuel issue carb could need gone thru? Possibly a new plug?

How did it run before it sat?
 
I'd say get all the old fuel out if not done already and get the carb checked. It may take a bit to get good fuel to get thru it if nothing is plugged. Today's gas sucks Try a new plug to get out the easy way and make sure u have spark
 
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